83 300SD cruise control ??

Tomorrow we're getting ready to leave on a 2000 mile trip and my cruise doesn't work. About a month ago it got intermittent and I had to try several times to get it turn on and then it would be OK. Later it wouldn't turn on after repeated tries then it turned on at least twice by itself. I'm guessing it was because I was trying to get it to go and it has some kind of memory or a latch relay. The tach is OK and I've got the circuit card out, Part No. 002 545 16 32 and can't see any trace or solder problems with a high power glass. I used to be a radio and TV repairman and into ham radio so I know quite a bit about electronics. I've resolderd the treaces at the plug but that didn't help. I see several electrolytic capacitors and I wonder if they tend to fail? Anyway if anyone can tell me what the common part failures are and could it be elsewhere like the steering column stalk or elsewhere. I tired to post a similar message before I registered but I havene't seen it but if this is repeateing myself, I apologize.

73 Hank WD5JFR
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Henry Kolesnik
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