As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO TUNE ILS OR GS ON NAV 1 RED X ON PFD X ON BOTH DISSAPPERAD WITHIN 8.0 NM OF RUNWAY. NO FAULT FOUND PERFORMED OPERATIONS CHECK OF VOR, ILS & GS IAW AMM 34-32-00. OPERATIONS CHECKED GOOD COULD NOT DUPLICATE PROBLEM AT THIS TIME.