As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACK LIGHT COMES ON UNEXPECTEDLY DURING MASTER CAUTION RECALL. AT CRUISE FL370 BRIEF ACRID SMELL IN COCKPIT (20 SECONDS) FOLLOWED BY A CALL FROM THE SENIOR F/A SAYING THE PASSENGERS OVER THE WING AREA RT S. REMOVED AND REPLACED TEMPERATURE CONTROL VALVE IAW MM. OPS CHECK GOOD. (K)