What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS DURING PREFLIGHT F/OS INDBD MFDU BLANKED . MFDU, POSITION SWAPPED. DURING, FLIGHT UPPER CTR MFDU BLANKED . ACTIVATING DSPL, CTRL SWITCH RESTORED OPN HOWEVER L INDBD MFD SWITCH, ON DSP WOULD NOT ACTIVATE. REMOVED AND REPLACED LEFT AIMS M003 IAW 31-41-11. OPERATIONAL TEST PASSED IAW 31-41-00. REPLACED UPPER CENTER AND LOWER CENTER DISPLAY UNITS IAW 31-61-00. INSTALLATION TEST COMPLETED IAW 31-61-01. OK FOR CONTINUED SERVICE. (SEE SDR # AALA201906199013)