What was found
DURING CRUISE LEFT PACK TURNED OFF, RIGHT PACK WOULD NOT HOLD CABIN ALTITUDE. CABIN MASKS DROPPED. RIGHT HAND PRESSURE LINE TO PRESSURE REGULATOR CAME LOOSE, INSTALLED NEW RUBBER DUCT, LEAK CHECKED GOOD. CLEANED AND REINSTALLED CABIN O2 MASK. DURING FUNCTIONAL CHECK FOUND 20 DEF AND 26 DEF PSU DOOR DID NOT DROP. CLEANED PAINT FROM LATCH AND LUBED LOCK PIN AT PSU 20 DEF AND REMOVED AND REPLACED PSU PANEL AT ROW 26 DEF.