What was found
PHL - DIVERSION - FLT 0419 - DURING CLIMBOUT FROM BDL EN ROUTE FOR PHX RECEIVED CLASS 1 ECAM MESSAGE FOR FORWARD AND AFT CARGO SMOKE FOLLOWED BY FORWARD & AFT SMOKE DETECTOR FAULTS, ALSO RECEIVED LAVATORY SMOKE DETECTOR FAULT, DIVERTED TO PHL. MAINTENANCE REMOVED AND REPLACED SMOKE DETECTOR CONTROL UNIT (10WQ) IAW AMM 26-17-34-04, OPERATIONAL CHECK WAS GOOD. FUNCTIONAL TEST OF SMOKE DETECTOR CONTROL UNIT COULD NOT DUPLICATE REASON FOR REMOVAL. UNIT WAS TESTED IAW CMM 26-17-34 AND RETURNED TO SERVICE.