What was found
PHX - AIR TURN BACK - FLT 126 - "C" - DURING CLIMB OUT OF PHX ENROUTE TO MKE BETWEEN FL360 AND FL370 RECEIVED WARNING MESSAGE THAT R/H WINDSHIELD WINDOW HEAT WAS INOPERATIVE, AIRCRAFT TURNED BACK TO PHX AND LANDED UNEVENTFULLY. MAINTENANCE TROUBLESHOT SYSTEM AND REPLACED WINDOW HEAT COMPUTER #2 IAW AMM 30-42-34. EXAMINATION POST FLIGHT REPORT ALSO REVEALED ECAM WARNINGS AT SAME TIME OF WINDOW HEAT WARNINGS FOR NAV RA 2 FAULT, RECORDER FDIU FAULT, AND R/H ANTI-ICE WINDSHIELD, ALL HAD ASSOCIATED FAILURE MESSAGES. ALL SYSTEM USE THE PHASE B BUS #2 AND ALL HAVE CONTACTOR 9XU2 IN COMMON. REPLACED 9XU2 3-POLE CONTACTOR IAW 24-22-55-401, OPERATIONAL CHECK OF SYSTEM WAS GOOD. PART NAME; WINDOW HEAT COMPUTER, MFG; SAGEM