As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED DURING MASTER CAUTION RECALL. RESETS DURING MASTER CAUTION. GROUNDED - YES. ACCOMPLISHED ZONE TEMP CONTROL BITE PER B737-900 FIM 21-62 TASK 801, FOUND RAM AIR ACTUATOR FAULT. ACCOMPLISHED FIM 21-62 TASK 837. REMOVED AND INSTALLED NEW RAM AIR ACTUATOR PER B737-800 AMM 21-51-21/401, RAM AIR INLET ACTUATOR TEST PASSED. NO FAULTS FOUND. GROUND VERIFICATION SUCCESSFUL.