As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PACK LIGHT ILLUMINATED THREE TIMES IN FLIGHT AND DID NOT GO OUT WITH MASTER CAUTION RESET. LIGHT PUSHED IAW QRH. TRIP RESET THREE TIMES IN FLIGHT BUT PACK LIGHT KEPT COMING BACK ON. ACFT GROUNDED. PERFORMED CLEANING OF PRIMARY AND SECONDARY HEAT EXCHANGERS ON RT AND LT PACK IAW TC 78121000. OPS CHECKED AND BITE CHECKED GOOD.