As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VTK FLAG SHOWS ON CAPTAINS SIDE. INTERMITTENT LANDING ALT EXTINGUISH, FMC SELECTION GOES AWRY AND GND PROX INOP APPEARS. EVERY 5 MINUTES EVERYTHING RESTORES THEN FAILS AGAIN. GROUNDED - YES. PERFORMED FIM 34-61TASK 836. OPS GOOD. NO HISTORY LAST 30 DAYS.