Tech found Tstat for newly installed Trane heat pump blank. Reset new 40 amp breaker and found outdoor fan turning slowly due to back feeding voltage. Tech found 10 volts on Y (between blue and yellow) with no Y call from Tstat. Tech turned off power and unplugged 2 stage compressor. Tech confirmed compressor is shorted to ground. 10 volts is no longer present at low voltage Y circuit with compressor unplugged. Vision Pro responds correctly. Compressor data tag shows signs of heat warping. Compressor wiring harness is partially melted. See picture. Left compressor isolated and unplugged with harness isolated with electrical tape. Found the Vision Pro thermostat wired and set up correctly. Tested the rest of the system from Tstat and found no issues. All other components are responding correctly. Heat strips, blower and outdoor fan are amping correctly. Tech left system in emergency heat. System was installed a few days ago. Need to order new compressor and wiring harness under full