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We had the exact same issue on Coach 1241.  I replaced the water separator as it was leaking through a crack in the clear filter bowl.  I was also able to rebuild both of our compressors with a Thomas rebuild kit that made a big difference in their performance.  The compressors would typically run for about 90 seconds to 2 minutes before cutting off.  Now they run for about 15 seconds before cutting off.  The kit is about $150 and includes new pistons/seals and cylinder liners. 

Thomas p/n: SK2668T (from usathomas.com)

I like how robust the Thomas are but they are too loud for me. I replaced mine with a ultra quiet 12v compressor. I have been running it for while with no issues. I cannot say how it will do in the long run but being that its a fraction of the cost of a thomas, I will probably buy a second one and keep it as a spare. 

Here is a video of my install:
https://youtu.be/iErFuYbyxv4?si=jER-b3YEfzpurPY7

My 120v compressor is a gast and I am planning on moving it from the generator bay and replacing it with a California Air compressor. That project has been put on the back burner as I have been sidelined with getting some other projects done.