What was found
AFTER T/O. ACFT FAILIED TO PRESURIZE FRM APU. RETURNED TO DEPARTURE AIRPORT. CABIN CONTROLLER WAS SET TO 0 & 30.00. REMOVED DEFECTIVE EJECTOR JET & INSTALLED A NEW EJECTOR JET IAW 21-31-04. OPS CHKD GOOD. REMOVED CABIN PRESSURE SELECTOR VALVE & INSTALLED REPAIRED SELECTOR VALVE IAW AMM 21-31-10. REMOVED EJECTOR JET &PERFORMED VISUAL INSP. NO DEFECTS NOTED. PERFORMED VISUAL INSP OF EJECTOR JET CONNECTING TUBES. NO DEFECTS NOTED. INSTALLED EJECTOR JET IN IT`S ORIG POSITION. WORK IAW AMM 21-31-04. REMOVED DEFECTIVE EJECTOR JET & INSTALLED SUPPLIED EJECTOR JET IAW 21-31-04. CONNECTED BATTERIES, ENERGIZED ACFT & STARTED APU. PERFORMED PRESSURE OPS CHK, MANUAL & AUTO MODES IAW 21-31-00. NO DEFECTS NOTED.