As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DEPARTURE, HEARD A THUMP OR BANG IN WHAT WE THOUGHT CAME FROM BELOW THE FO`S FLOOR SHORTLY AFTER WE STARTED SMELLING A VERY STRONG ELECTRICAL BURNING TYPE SMELL. RETURN TO EWR. SMELL REDUCED DURING DESCENT AND WENT AWAY F/O AWHILE BUT RETURNED DURING APPROACH REF LG PG 8695594 R&R OF FWD EQUIPTMENT EXHAUST DETECTOR ALSO FOUND FO`S EHSI SCREEN DEGRADED BRIGHTNESS. REMOVED AND REPLACED PER MM 34-22-04 PAGEBREAK 401 OPS CHECK GOOD A/C SET UP FOR EVAL FLIGHT REF LG PG 8695595.