Encountered same issue several years ago on our first coach (1995 AS Land Yacht), here is the process we followed to replace the cooling coil:
Cooling Unit Replacement - External Connections
Reviewed forum advice and YouTube Videos, so decided to perform a little advance prep work.
Shut off Propane at Tank
Lit Stove Top to burn off residual propane in the lines.
- Removed Outside Access Panel
Pulled Power Cord from 120V Receptacle
Disconnect Propane Supply Line
Removed bolt securing Right Side of Refrigerator
Removed bolt securing Left Side of Refrigerator
Disconnected 12 volt
Capped 12 volt
More to come...