What was found
FLT#821, JFK-NAS. (AIRCRAFT PERFORMED AN AIR TURN BACK TO JFK) ' ELEC BCL 2 FAULT ECAM APPEARED WHILE IN CRUISE; AS PER TSM 24-38-00-810-848-A & ASM 24-38-02, REPLACED CONTACTOR 6PB2 IAW AMM 24-38-58. OPS TEST OK. NO FAULTS NOTED. (REPLACED RELAY 16XC - NO FIX)