The sometimes-it-starts-and-sometimes-it-doesn't is often caused by either the main relay intermittently going bad, or the TW sensor, located next to the thermostat.
See message 6 on this thread for TW:
https://www.3geez.com/forum/showthrea...ght=main+relay
The main relay as said is located on the left side of the opening, once you take out the change drawer. It fails because micro-cracks (too small to see) develop in the solder connections of the two coils inside the relay cover. I bought a new one, because I had such a bitch of a job unbolting it and getting a new one in, that's why people say just unplug the old one and plug in a new one and zip-tie it somewhere.
I got mine out without unbolting the fuse block, but if I would have done that it would have been much, much easier. I'm not a fan of short-cuts like the zip ties, but to each his own.
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