What was found
(CAN) UPON A NON-ROUTINE DEPLOYMENT OF THE OXYGEN MASKS ON THE GROUND BY MAINTENANCE. OXYGEN CONTROL UNIT (10WJ) WAS PLACED INTO (OVERRIDE) TO MANUALLY DEPLOY THE PAX OXYGEN MASKS. THEY DID NOT DEPLOY ON COMMAND. MULTIPLE ATTEMPTS WERE MADE TO MANUALLY DEPLOY THE PAX OXYGEN MASKS IN (OVERRIDE). THEY STILL DID NOT DEPLOY. OXYGEN CONTROL UNIT (10WJ) WAS REPLACED IAW MP35-203, OPS TESTED SERVICEABLE. PN OFF: RVA71-01 SN OFF: 0640 ATSO: 1563.8 ACSO: 711. FAULTY OXYGEN CONTROL UNIT FORWARDED TO MFG FOR EXCHANGE. (TC NR 20070123012)