Did a lot more work today to bring the SEC back from 26 months of rest.
First, I vacuumed all of the small leaves that were in the sides under the hood and the fuse box area. Wasn't bad, but there were some leaves and detritus down there that I was able to pretty much suck all out.
Next, I took the shop vac and sucked up all of the cob webs that had built up under the car.
Then I removed each front wheel (jacked up each side of the car) and removed and checked the ABS wheel sensors. Both were in pretty good condition with little to no iron filings on them. However, the wiring and sheathing is old, and cracked, and in need of replacement. These cables are still available, but are not cheap. Nevertheless, I believe that I will order a pair.
While I had the lug bolts off the car, I ran over each one with a wire wheel (there was a slight bit of surface rust on many of them) and then clear-coated them with some automotive clear-coat paint - two coats. We'll see how that holds up, but the lugs look much nicer. I need to do the same with the rears, and will try to tackle that over the weekend when I have some time.
What is more concerning is that I saw that the brake support rod bushings on both sides are TOAST. Everything else looked in pretty decent condition with the front suspension, but those brake support bushings are going to have to be replaced. I guess that means a complete dog-bone removal and refurbishment. It's been 19+ years, so I can't complain about this. Needless to say, will be good fodder for a future HOW-TO.
I cleaned off the engine and the engine compartment. It was quite dusty from the car's slumber under the car cover, but it cleaned up nicely. I'll go over everything again a second and then a third time, but it's looking fairly clean. It's hard to believe that it's been 11+ years and about 65,000 miles since I pulled the heads and redid the top end of the engine.
The most nagging issue that happened not long before I stopped driving the car, was an ABS light that would come on not long after starting the car and driving a little ways. The ABS pump was sort of freaking out, and then it would just stop and the ABS light would come on. This is why I checked the ABS wheel sensors - I thought that they might be clogged with iron filings (they weren't).
The next step in the ABS system diagnosis was to check the two relays on the top of the pump, underneath the plastic cover. I happened to have a spare pump from a wrecking yard, because the pump is shared with my G-wagen. I cannibalized the two relays and installed them, and drove the car for a three-mile test drive before dinner. No ABS light. I'm not quite ready to call this one solved, but it is looking promising.
A lot more to do, but the next thing I will tackle is the wiring for the passenger side seatbelt presenter. I believe this wiring was compromised when the body shop put the door sill plate and everything back together after the accident repair. I did a fair bit of diagnosis of the mechanism itself, and have 2-3 spare arms for that side, as well as 3-4 spare relays. Nothing changed when I swapped out parts, so I believe that a wire may be shorted between the door switch and the rear window area. So I will attack that issue next.
Lots more to do, including the rear suspension, which I need to finish the removal and installation of. I have all of the parts needed and will try to get to this in the coming couple of weeks.

Problem is confirmed solved. Took another 10-mile test drive and the ABS pump fired off in the driveway as I started moving, as it is supposed to. Glad it was an easy fix. Glad I had the spare pump to donate the relays. I am going to have to get another pair or two on the next couple of ABS pumps I find.