As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT NOT GROUNDED: PILOT REPORTS INTERMITTENT SYSTEM FAILURE WARNINGS ILLUMINATED ON THE HUD COMBINER THE DURATION OF THE WARNINGS WERE JUST 1-2 SECONDS. THE FIRST OFFICER HUD ANNUNCIATOR PANEL ALSO ILLUMINATED SYSTEM FAIL BUT ALSO JUST FOR 1-2 SECS. ALL HUD INDICATIONS APPEARED NORMAL. MAINTENANCE ACCOMPLISHED HUD TEST IAW MM 34-36-00. TESTS OK.