Justification for Thermal Panels

Hello all. I am working on a roof that we have to replace thermal water heater panels. The insurance company is giving us lots of problems with paying for them to be detached, drained of toxic chemicals, removed from roof ( they weight roughly 500lbs each), and then reassembled.

Does anyone have justification or an Xactimate note that would accurately detail this work required so I can have this approved?