What was found
*AIR TURN BACK* ATB LFMC FAIL QRH PROCEDURE COMPLETE BOTH ND DISPLAYS BLANKED, R FMC UNABLE TO LOAD NAV DATA, QRH BOTH FCM FAIL PROCEDURE. NO ACCESS TO ANY ROUTE DATA ONLY ACARS AVAILABLE VIA NOTH CDUS. R&R LH AND RH FMC'S PER AMM 34-61-01. UPLOADED ALL SOFTWARE TO LATEST PN PER AIRCRAFT SOFTWARE MATRIX VERSION 153.XLSX. OPS CHECK GOOD AT THIS TIME.