As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TROUBLESHOT BOTH NR 1 & 2 GPS SYSTEMS DUE TO BEING INOPERATIVE. FOUND NR 2 ANTENNA RESISTANCE CHECKED OK, ANY TIME NR 2 GPS SYSTEM TURNED ON IT CAUSED A BLOCKAGE OF ALL GPS SIGNALS TO ACFT. WITH NR 2 GPS SYS TURNED OFF NR 1 GPS SYS OPERATED GOOD WITH NO PROBLEMS NOTED. INSTALLED NEW NR 2 ANTENNA AND BOTH SYS OPS TESTED OK WITH NO PROBLEMS NOTED.