As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AT THE TOP OF CLIMB THE NR 2 ENGINE FUEL FILTER BYPASS LIGHT ILLUMINATED. ENGINE PARAMETERS REMAINED NORMAL. IAW THE FLIGHT OPERATIONS MANUAL THE CREW DECIDED TO RETURN TO DEPARTURE. THE FUEL FILTER SWITCH WAS REPLACED IAW AMM 73-34-01 AFTER A SUBSEQUENT FLIGHT.