As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IMMEDIATELY AFTER LIFTOFF, RECEIVED NR 4 ENGINE THRUST REVERSER EICAS MESSAGE. AIRCRAFT RETURNED TO FIELD. *S/D* EICAS MESSAGE WAS FIXED BY REPLACING 4 RELAYS IN THE INDICATION CIRCUIT. THE RELAY NUMBERS FROM THE WIRING SCHEMATIC 78-36-04 PAGE 101 SHEET 1 WERE K7363, 7370, 7374, AND 7378.