As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STARTED NR 2 ENGINE, ABOUT 1 MIN AFTER START GOT A FILTER BYPASS LIGHT. LET IDLE FOR 2-3 MINUTES WHILE DOING CHECKLIST. NO CHANGE AS WE TAXIED BACK TO THE GATE PUSHING THE POWER UP ON NR 2 ENGINE THE LIGHT WENT OUT AND DID NOT RETURN. GROUNDED - YES. FOUND NR 2 FUEL FILTER DIFF PRESSURE SWITCH (S241) FAILED. REMOVED AND REPLACED NR 2 SWITCH (S241) IAW AMM 73-34-01. OPS TEST GOOD IAW AMM 73-34-01-400-801-F00. ETOPS GROUND VERIFICATION GOOD.