What was found
DURING CRUISE FLIGHT AT FL360 RIGHT PACK TRIPPED DURING CHECKLIST FOR THE PACK TRIP OFF, THE LEFT PACK TRIP LIGHT ILLUMINATED, THE CABIN CLIMBED RAPIDLY; DURING THE EMERGENCY DESCENT, BOTH PACKS RESET; MAINTAINED PRESSURIZATION AT 12,000 FT FOR ABOUT 25 MINUTES DID NOT DROP THE MASK IN THE CABIN. REMOVED AND REPLACED P5-10 PANEL PER MM.