I have a 2012 Syper RT. The rear air suspension system is not working. It's like I'm riding on the frame. I don't hear the air compressor. I tried putting air in manuallly through the schraeder valve, but it doesn`t hold air. The fuse keeps blowing. I'm thinking the compressor is not working, plus I have a leak somewhere. Any ideas for a cheap fix? I know it's costly to replace the compressor.