Got a call,walk-in warm..found comp. cycling off low press. switch. hook on my manifold. system is r22 press, actual 145psig and 15 psig on suction line. system leak I thought. started to add refrigerant. pressures wouuld not come up.so pulled out all refrigerant,nitrogen press test,no leaks, pulled 500 microns and add R-22,still cant get suction or head press.(had lo press. switch jumped) press. do not equalize when i turn off comp. liquid line solenoid energized and calling. thinking bad comp, as it will not hold a pumpdown.cooler is at 75 deg. so txv valve should be open and press. should equalize during off cycle,right? now i am not sure if i should change comp. Am I missing something???