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Will do! I've got a new bell-crank and nylon bushings in the mail and will report back!

I was on a 100 mile round trip today so I watched the IAC to see how mine behaves. Nothing about my car is stock, so don't take the numbers as gospel but I think the general trend is accurate. Steady cruise at 60-65mph on relatively flat ground, rpm is ~1800 and the IAC counts are 90-100, let off the throttle and just coast at the same speed and the TCC unlocks, the rpms stay pretty much the same and the IAC counts drop to around 70. They stay right in the 70 range for 1/2 mile or so but as soon as brakes are applied to slow down, the IAC counts drop off fairly quickly to the ~40 count number at idle. It seems there needs to be a brake signal for the IAC opening to drop off toward idle.

I dove deep enough to think maybe I had ruined the whole unit! Never did find a release or catch or other way to return the cassette tray to the eject position. I tried turning the unbelted wheel with my finger, no results. Probably need to turn whatever little wheel that one was driving, but couldn't see it or reach it even with the circuit boards moved out of the way. I'm afraid that if I get it any farther apart, something will go "Sprong!" and it will never go back together again. Managed to get it all put back together, just one screw left over 🤪

I am pretty sure the 91 is as my 90 and that is the bright filament in the outer two tailight bulbs is powered directly from the turn and brake lights in the cabin. The third, or inner bulb of the three for stop/turn, is sort of like the above except there is a relay bank in the trunk on the right side wheel housing. Each side has a dedicated relay for that single inner high filament. The relay is hot at all times and the brake/turn wire trips the relay. My guess is a relay hangs up.

I continued to look at why I kept getting a B440c code. So I decided to swap the programmer for another one on the shelf. Same deal, kept throwing the 440 code. So I did an override while reading the B028. It kept pointing to either a binding door or lost ground. So I decided to remove the BCM to look at the travel of the rod and if it was binding. Everything looked fine with clear travel of rod opening and closing the blend door with no binding. So I put the BCM back in and plugged the three connectors back in and am happy to report that I no longer have a 440 code and the air works fine. Must have been a bit of corrosion on one of the connector plugs. At any rate the A/C is blowing ice cold [not like the lukewarm of before] and no codes. Ready for the road as tomorrow I have appointments and it's supposed to hit 80.