As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON WINTER MAINTENANCE, IT APPEARED THAT THE AIRFRAME FUEL FILTER WAS IN BY PASS MODE BECAUSE THE BYPASS INDICATOR PIN WAS STICKING OUT. UPON DISSASSEMBLY IT WS NOTICED THAT THE RED INDICATOR HAS SEPARATED FROM THE INDICATOR PIN GIVING A FALSE INDICATION. THE FILTER WAS NOT IN BYPASS. THE FILTER ASSEMBLY WAS REPLACED. (TC# 20090922005)