What was found
AFTER POS 4 BACK, THE PARKING BRAKE DIDN'T WORK. AFTER CB'S RESET, ECAM MSG BRAKES ALTN BRK FAULT APPEARED. IAW AMM 32-43-34-000-+001400-001A THE ALTERNATE CONTROL UNIT, ABSU, WAS R & R. OPERATIONAL TEST WAS SATISFACTORY. PN E21328002, SN OFF S01420 & SN ON S01164.