I have a Craftsman pancake style 6gal compressor, model 919.153160 that will get up to 150psi pressure but is leaking the entire time it is pumping (not leaking from hoses, drain, regulator, etc.). It will shut off when getting to pressure but continues to leak down and then when it tries to re-start, it will kick in but not start several times before ita actually does re-start. What needs to be replaced?