[GORDON HUMMEL]

I suspect that when the solonoids were replaced, they were not wired back correctly. I'm assuming you have the same 6 pack solonoids as the later models. Looking at my 6 pack, the travel solonoids are on the right. down on the left; up in the middle. Get a test light & go back to the solonoids & with the engine running, you should have power to the travel solonoids. If you have power & they are working, then you have a plumbing problem with the air lines.
In as much as you can level manually, I suspect the plumbing is ok. Might want to have someone operate the up & down switches while you check out power to the solonoids with a test light.
On my coach, the power to activate the travel solonoids comes of a solonoid that I think goes to the transmission.

If the above does not help, a close up picture of the rear 6 pack would helpful