What was found
FLT 233 SLC-LGB, DIVERTED TO LAS DUE TO THE INTERNAL NAVIGATION SYSTEM READING 1500 MILES OFF COURSE. AFTER TAKEOFF FROM SLC, FMS 1 & 2 POSITION FAULTED TO AN EAST COAST LONGITUDE. GPS 1 & 2 WERE ACCURATE. NO ECAM MSG EXCEPT GPS PRIMARY LOST. UNABLE TO RECOVER RELIABLE NAV DATA. LAS PERFORMED FULL ALIGNMENT OF IR SYSTEM IAW 34-10-00-710-001 ALIGNMENT SUCCESSFUL. ALL PARAMETERS NORMAL AT THIS TIME. A/C OK FOR SERVICE. REFERENCE LOGPAGE 845304, ITEM NR 1 AND LOGPAGE 845302 ITEM #2, NAVS WOULD NOT ALIGN. REMOVED AND REPLACED ADIRS CDU (2FP) PER 34-12-12-04. OPS CHECK OK. NO FAULT NOTED. ACCOMPLISHED FMS NAV DOWNLOAD PER AMM 27-70-00-03. UPLOAD SUCCESSFUL. ACCOMPLISHED FULL ALIGNMENT OF ADIRUS PER AMM 34-10-00-710-001. NO FAULT NOTED.