I'm having the Level 2 PEM Gruber treatment done right now due to my ridiculous back up light issue in this thread:
Reverse Back Up Lights Not Working - Blown Fuse?
It was either that or paying Tesla $8000 for a remanufactured PEM that I imagined was pieced together with old parts from other PEM's. At this point I'm trusting Gruber more with the PEM than Tesla.
I'd suggest you inspect the PEM FAN connector on teh harness and make sure its not damaged. I'd just replace it every time I pull the pem for good measure. Its only about $10.00 in parts and you have the PEM off which make it WAY easier to replace.
\Molex PEM Connectors
Fan Plug
19418-0004 Automotive Connectors 4CKT RECPT 14-16AWG
0194200009 Automotive Connectors MX150L 14-16 AWG HPA FE SN