I recently came across a system that was out on oil pressure i reset the system and observed my oil pressure. I was running 50 psi of oil pressure. I went ahead and replaced the compressor contactor due to it looking pretty burnt. I put the system into defrost to check pump-down. This has a Sorit 20-0/100. When the system pumps down. the high pressure line bleeds through the bottom pilot line causing compressor short cycling. I re-built the EPR valve and same thing. (The high pressure line comes off the discharge line about 2 ft. from the compressor service valve.)
I've done a little research and am thinking the high pressure line needs a solenoid to shut it off during pump down and the liquid line solenoid that is in manual lift needs replaced to completley pump the system down.