What was found
GEAR DOOR LIGHT AND EICAS WARNING WITH GEAR INDICATING SAFE. UPON GO AROUND, GEAR DOOR LIGHT EXTINGUISHED. NEXT LANDING ATTEMPT THE GEAR DOOR LIGHT WAS ILLUMINATED AGAIN. LANDED UNEVENTFULLY. QRH PROCEDURE COMPLIED WITH AFTER GO AROUND. VERIFIED WITH INBOUND LINE MX THAT GEAR DOORS WERE CLOSED UPON ARRIVAL AND NO REPORTS OF VIBRATION FROM CREW. T/S GEAR DOOR FAULT REF B767 FIM 32-09 FAULT TREE 806 FIGURE 105A. PERFORMED BITE CHECK OF THE PSEU REF B767 FIM 32-09 FAULT TREE 803 FIGURE 103. FOUND BIT CODES 422, 264T, 260T, 257T, 256T AND 255T. SUSPECT FAULTY CARD FILE IN PSEU. REMOVED AND REPLACED PSEU REF B767 AMM 31-70-04-4-99. OPS CHECK GOOD AT THIS TIME.