Rebuilt 727 no reverse took off pan help

at the very least, I'd air test all the hydraulic ports when you have dropped the valve body.
But, I agree, I'd be pulling everything apart to check all the clearances, and that all the seals are in place. Like that video somebody offered up, you need to closely inspect all the parts. If you catch him charging you for something which was never installed, that would certainly help to nail it as fraud, not just incompetence.