What was found
RETURNED TO DEPARTURE, NAV GPWS FAULT /TERR FAIL IN FLIGHT, ECAM ACTIONS . NO GPWS/TERR OPERATIONAL. IAW TSM TASK 31-32-00-810-843A, R & R CFDIU, 1TW, IAW MM 31-32-34-401, BITE/OPS CHECK GOOD. OK TO CONTINUE. PERFORMED BITE CHECK OF GPWS IAW 34-48-00-740. BITE OK, NO FAULTS DETECTED. OK TO CONTINUE.