As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FLT 260 - AFTER TAKEOFF, THE RT AIR CONDITIONING PACK FAILED CAUSING THE AC TO LOSE PRESSURIZATION. FLIGHT RETURNED TO PHL. MAINTENANCE REPLACED THE RT AIR CONDITIONING SUPPLY PRESSURE INDICATOR SYSTEM. OPERATIONS CHECKED GOOD. (W)