As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. FLIGHT RETURNED TO PHL ACCOUNT DUEL FUEL FILTER CLOG INDICATION. CREW DECLARED EMERGENCY AND LANDED OVERWEIGHT WITHOUT INCIDENT. REPLACED ENGINE 1 FUEL FILTER DIFFERENTIAL PRESSURE SWITCH. ALSO SEE AALA201705039012, AALA201705039013 & AALA201705039014.