What was found
ETOPS SIGNIFICANT SYS - FRM 21300900 CABIN PRESSURIZATION UNBALE TO MAINTAIN SCHEDULE ALTITUDE AT FL 380 W/ENT ANTI ICE ON. DUCT PRESS 15 PSI, OUTFLOW VLV FULLY CLOSED, CABIN CLIMB AT 300 FPM REACHED 8500'(SCHED IS 6500') COND SAME IN AUTO 1 OR AUTO 2 W/ENG ANTI ICE OFF CABIN ALT DESCEND BACK TO 6500'. PERFORMED FIM21-31-00 FIG 103. NO DEFECTS NOTED. PERFORMED AMM36-23-00 AIR SUPPLY BITE SYS TEST NO DEFECTS NOTED TOOK AC ON HI PWR RUN NO DEFECTS NOTED ON L/R ENG BLEED AIR SYS. ACCOMP FIM36-10-00/101 FIG 28A R & R BOTH LT/RT PRV CONTROLLER IAW AMM36-11-19. OPS & SEC CK OF PRV CONTROLLERS GOOD IAW AMM36-11-19.