As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN FLIGHT, THE FLIGHT CREW RECEIVED #2 FUEL FILTER BYPASS WARNING LIGHT. THIS RESULTED IN AN AIRBORNE RETURN TO ORIGINATING POINT. REPLACED THE #2 ENGINE FUEL FILTER IAW AMM 73-10-00-02 & TIB DH8-73-06. AIR/LEAK & VISUAL CHECK OF FILTER INSTALLATION COMPLETED WITH NO FAULTS FOUND.