What was found
FLT#1833, BOS-SFO. (ETOPS) 'ACT XFER FAULT (CRZ FLT) ( CAUTION ON ECAM 5) ACT XFR FAULT (ACT) ); REF L/P 4189199, ITEM 2 (FOUND ACT OVER PRESSURE PROTECTOR 256QM BROKEN. R & R IAW AMM 28-12-42. OPS CHKD GOOD. OPS TEST OF THE ACT AUTOMATIC TRANSFER SYS IAW AMM TASK 28-28-00-710-005. (DUE TO FAILED ATTEMPTS TO PRESSURIZE ACT WHILE TROUBLESHOOTING ACT XFER FAULT, AFTER OVERPRESSURE PROTECTOR WAS REPLACED PERFORMED FUNCTIONAL CHK FOR LEAKAGE OF THE VENT/ TRANSFER INNER PIPES & THE ACT BLADDER PER AMM 28-28-00-790-802-A NO FAULTS NOTED) PERFORMED OPS TEST OF ADDITIONAL CENTER TANK (ACT) AUTOMATIC TRANSFER SYSTEM IAW AMM 28-28-00-710-005-A TRANSFER SUCCESSFUL, NO FAULTS NOTED.