As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE FL 360, MASTER CAUTION ILLUMINATED W/ LT PACK LIGHT. RAN QRH AND LIGHT EXTINGUISHED WHEN MASTER CAUTION PUSHED. NO PACK OVERHEAT NOTED. ACFT GROUNDED. REPLACED LT PACK TEMP CONTROL VALVE. TEST, BITE TEST, LEAK CHECK ALL GOOD REF MM 21-51-10.