I would check the contactors. I've been nursing a 40 year old gas pack along for years, replacing parts as they go bad. My unit has two contactors for the fan and compressor. They are open frame so you can literally see them energize.
When one of them failed, I could take a screwdriver (CAREFULLY! 240V!) and press the center of the contactor and the fan would start up.
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-Evan
Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63
Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250
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