What was found
PHX - AIR TURNBACK - 6/2/01 - FLT 73 - ON DEPARTURE CLIMBOUT OF PHX THE AIRCRAFT LOST VOR NR 1, VOR NR 2, ILS NR 1 & ILS NR 2; THE AIRCRAFT RETURNED TO PHX. IN PHX MAINTENANCE RESET NR 1 & NR 2 RMP NAV SWITCHES AND CIRCUIT BREAKERS; CYCLED NR 1 & NR 2 FMGC CIRCUIT BREAKERS AND PERFORMED ADIRU REALIGNMENT. PERFORMED AFS TEST 22-96-00-501 W/ NO FAULTS NOTED. PERFORMED NR 1 & NR 2 VOR, ILS AND ADIRU'S BITE TEST W/ NO FAULTS NOTED AND NR 1 & NR 2 RMP BITE TEST W/ NO FAULTS NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE AND NO FURTHER DISCREPANCIES HAVE BEEN REPORTED.