[ChuckS]

Look oks like you are making progress. The other two solenoids you see on the manifold block are for passenger and drivers side mid and rear leveling jacks...each side mid/rear operate in tandem...

The fact your manual over ride switch for the landing gear does nothing but click a relay tells me ... I think.. that the issue is somewhere in the pump motor circuit..

Or.. the BCM is at fault but the likely good of both leveling and slide system circuits on the BCM being bad at the same time doesn’t quite pass my logic test...

Please update your findings as you progress along...