What was found
RIGHT PACK CAUTION ILLUMINATED ON TAKEOFF. FOLLOWED QRH TO STEP 3, PACK CAUTION EXTINGUISHED WITH TRIP RESET. ACFT GROUNDED. RT PACK RAM AIR PRIMARY DIFFUSER ASSEMBLY FAN BYPASS CHECK VALVE DOOR AND DOOR HINGE PINS FOUND MISSING FROM THE PRIMARY DIFFUSER. ACCOMPLISHED CONDITIONAL INSPECTION FOR PART DEPARTS AIRPLANE IAW AMM 05-51-59/201. NO FURTHER DAMAGE NOTED. REMOVED AND REPLACED THE RT PACK RAM AIR PRIMARY DIFFUSER FROM THE PLENUM IAW AMM 21-51-03-000-805-002 STEP 2G(24). R/H A/C PACK LEAK AND OPS CHECK GOOD IAW AMM 21-51-03-400-804-002 STEP 3J. R/H AC PACK OPERATES NORMALLY IAW FIM 21-53 TASK 806 STEP E. PERFORMED PACK/ZONE TEMP CONTROLLER BITE TEST IAW AMM 21-61-00, NR 1 & 2 SYS BOTH OPS NORMAL, NO FAULTS NOTED. OVERHEAD PACK ANNUNCIATORS REMAIN EXTINGUISHED WITH MASTER RECALL.