As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI IN, #1 ENGINE FUEL FILTER BYPASS LIGHT CAME ON . NO OTHER ABNORMALITIES OBSERVED WITH ENGINE. GROUNDED - YES. OPENED COWL AND NOTICED CANNON PLUG DISCONNECTED FROM FUEL FILTER BYPASS SWITCH. INSTALLED CANNON PLUG TO F.F.B SWITCH AND RAN ENG WITH NORMAL OPS . CLOSED COWL A/C RETURNED TO SERVICE.