What was found
INFORMATION ONLY-CREW DEBRIEF- CREW REPORTED BOTH CAPTAINS DISPLAYS BANK, BOTH CAPT AND FO HUD DISPLAY BLANK, THEY COULD NOT ENTER ANY INFO TO AIRCRAFT USING THE CDU KEYS CORRECTION TO ABOVE INFO- DUE TO MISUNDERSTANDING,THERE WAS NO DISCREPANCIES WITH THE CAPTS OR FO HUDS CAPT SIDE SCREENS WERE BLANK BEFORE REMOVING GGM 1L . RPL GGM 1L REF MM 31-61-31-00A-720A S/W CONFIG CHECKED OK. OPS TEST OK NO MSG. PARTS USED: 78-3161-9-9001,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1718018 SN OFF 5924 MODULE, GRAPHIC OFF 78-3161-9-9001 5924 ON 78-3161-9-9001 1642