[Fulltiming]

What number is your coach? Last three digits of the VIN. #214 was the first 1990 model and #246 was the last. I have a 1992 #281 so our coaches are very similar. I presume you have the Detroit 8V92 with the Allison HT 740 four speed transmission. Be careful in what oil you put in the 8V92 if that is the engine you have. A low ash 40 weight oil is what Detroit recommended. I have the same generator. I have the manual with the wiring diagram if you need it. The air leaks will take so detective work to track down. All connections are suspect but since the suspension won't raise I would start examining ride height valves (1 in the front in the center left to right over the axle and one on each side in the rear behind the drive axle tires), the front and rear 6 packs (6 solenoids that controls the suspension height) and lastly the air bags. A massive leak from the air bags or ride height valves should be noticeable from the outside of the coach. You may have many leaks but only being able to get up to 70 psi isn't good. As you probably noticed, you need about 60 psi to get the air seat to raise, the generator slide out to open or close and the step cover and/or bay air slide to operate. You likely have an air operated wastewater dump valve on the passenger side of the wet bay. Those can also leak. Need more information on the awning. Is the fabric torn, if so is it just the round portion that slides into the metal cover rail or is the fabric toast? Are the end arms still attached and sturdy? Is the metal cover still in place (it is in the photo).