TMC 54-85 Internal Pressure problem

Hi guys

I have a problem with this compressor, the symptom is the internal pressure doesn't drop after unloading, it drops slowly along with the delivery pressure also give higher load on the motor ( around 75 amps ) while the other compressor which we have onboard ( same type) the internal pressure drops faster than delivery pressure and motor load is around 50 amps. I overhauled intake valve, change the solenoids for intake valve control and for blow down, still no improvement, 

Can you guys help me out? I am running out of options here

P.S sorry for my English its not my first language