As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RECALL, THE NR 1 PACK LIGHT ILLUMINATED. RAN QRH AND THE LIGHT EXTINGUISHED WITH THE MASTER CAUTION RESET. ACFT GROUNDED. PERFORMED A BITE ON THE NR 1 PACK ZONE TEMPERATURE CONTROLLER, LEFT PACK RAM AIR ACTUATOR FAULTED B737-800 FIM 21-61 TASK 801. REMOVED AND REPLACED LH RAM AIR ACTUATOR REF B737-900 AMM 21-51-21, OPS TEST WAS SUCCESSFUL AND PERFORMED BITE TEST TASK 21-61-00-700-806-002, BITE TEST SUCCESSFUL.