okay, i rebuilt the valve block and replaced the rear bellows for both sides. For some reason, it's not going up. I can hear the valve block ticking, the compressor runs, and I gave it a good 5-8 min afterward to get the tank to fill. i hear the rear sounding like it's filling, but i don't know if its hissing bc of a leak or if it's trying to fill. One thing i'm nervous about- I'm afraid the bellows that i got from shupack are going to blow because they are folded over alot. I have my jack raising it up a little in the back so that it doesnt completely crease the springs worse than they are now. Suggestions what next to do? i did see a small tear in the teflon ring around the compressor when i disassembled that, but from the sound of it trying to pump up the rear, i think it's ok enough to get the front and a$$ up in the air.