What was found
AIR CONDITIONING PACKS COULD NOT SUPPLY ENOUGH AIR FOR AIR CONDITIONING OR PRESSURIZATION. COULD NOT MAINTAIN REQUIRED CABIN ALTITUDE. TRANSFERRED TO NRWC 826-DFW-01971. FOUND LT RAM AIR DUCT BROKEN & LT RAM AIR CHECK VLV BACKWARD INSTALLED. R & R LT RAM AIR DUCT ASSEMBLY. INSTALLED LT RAM AIR VLV CORRECTLY IAW AMM 21-25-02. PERFORMED ACFT SYS, OPERATIONS CHECKED IAW AMM 21-51-00 & PRESS SYS. OPERATIONS CHECKED IAW AMM 21-31-00. ALL CHECKED GOOD.