As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ON MASTER CAUTION RECALL. GOES OUT ON MASTER CAUTION RESET. GROUNDED-YES. PACK ZONE TEMP CONTROLLER BITE, PER B737-900 FIM 21-62 TASK 801. SHOWED BIT AND PREV FLT FAULTS FOR LEFT PACK RAM AIR ACTUATOR, BUT VERIFY TEST DID NOT CONFIRM FAULT. ACCOMPLISHED RAM AIR SYSTEM OPERATIONAL TEST, PER B737-800 AMM 21-51-00-730-802. SEVERAL TIMES ALL TESTS PASS.