As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON MASTER RECALL IN FLIGHT LEFT PACK LIGHT ILLUMINATES AND EXTINGUISHES WHEN MASTER CAUTION SYSTEM IS RESET. ACFT GROUNDED. PERFORMED PZTC BITE IAW AMM 21-61-00-700-806-002 ON L/H PZTC. REMOVED AND REPLACED THE LT RAM AIR ACTUATOR IAW AMM 21-51-21/401. OPS CHECKED SATISFACTORY AND ETOPS GROUND VERIFICATION SUCCESSFUL.