[77newell]

The air suspension can be checked by seeing how long it stays up and level with all air sources shut down. That checks most of the system. You may want to check the airbags for cracks even if they are holding air. Since the engine oil has been changed you may want to have the engine air box covers removed and a visual inspection of the cylinders. Another engine check is the color of the smoke when it starts; blue smoke (lube oil) for any length of time is a signal of potential problems and warrants further checks. Same thing for the gen engine.

My 77 windshield seal leaked from the top and was cured with a bit of sealant, never a problem after that.