As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LH PACK LIGHT ILLUMINATES ON MASTER CAUTION RECALL. GROUNDED - YES. PERFORMED PACK TEMPERATURE CONTROL BITE REF B737-800 FIM 21-62 TASK 801. RIGHT PZTC BITE PASSED. LEFT PZTC BITE SHOWED PREV FLT LEFT RAM AIR ACTUATOR FAULT. FAULT CLEARED AND MULTIPLE VERIFY TESTS PASSED.