As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NR 1 FWD FILTER BYPASS LIGHT ILLUMINATED CLIMBING THROUGH 36500 FT. AIRCRAFT DIVERTED. NR 1 ENGINE FUEL FILTER REPLACED IAW AMM 73-11-02. NO EVIDENCE OF CONTAMINATION FOUND. AIRCRAFT PLACED ON MEL AND OPERATED IAW MEL 73-04-01. ENG FUEL FILTER DELTA P SWITCH REPLACED IAW 73-34-01 IN YYZ UPON RETURN. REPLACED SWITCH TO BE DISCARDED, NO FURTHER ACTION PLANNED FOR THIS OCCURRENCE.