As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FILTER BYPASS LIGHT ILLUMINATED DURING TAXI-IN. OPS NORMAL IN FLIGHT. ACFT GROUNDED. TROUBLESHOT NR 1 ENGINE IAW FIM 73-05, TASK 801. FOUND FUEL FILTER DIFFERENTIAL PRESSURE SWITCH FAILED. R & R PRESSURE SWITCH S241 IAW AMM 73-34-01. OP CHECK GOOD IAW AMM 71-00-00-800-811-FOO, STEP 3A.