As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AT FL 400, RECALL PUSHED AND LT PACK LIGHT ILLUMINATED WITH MASTER CAUTION AIR CONDITIONING, ALL TEMPS AND PRESSURES NORMAL. ACFT GROUNDED. REMOVED & REPLACED THE NR 1 TEMP CONTROLLER. OPS CHECKED GOOD IAW AMM 21-61-20. REMOVED & REPLACED THE LT RAM AIR EXHAUST ACTUATOR IAW AMM 21-51-27-000-801, & 21-51-27-400-801. OPS CHECKED GOOD.