What was found
AIR TURN BACK. FLIGHT CREW REPORTED NUMEROUS SYSTEM FAILURES (GPS, GPWS, NR 1 RA, NR 1 ILS, NR 1 ENGINE REVERSER, NR 1 FADEC). CHECKED LAST LEG ECAM REPORT AND WAS UNABLE TO VERIFY FAULTS WITH CREW OR AIRCRAFT. CREW STATED ALL (FAULTED) SYSTEMS OPERATED NORMALLY. ONLY SYSTEM REPORTING PROBLEMS WAS FWC NR 2. REPLACED FWC NR 2 IAW AMM 31-53-34 AND SYSTEMS OPERATED NORMALLY.