What was found
FORWARD SERVICE DOOR OPEN EICAS MESSAGE DISPLAYED AT FL380. RAN QRH, NORMAL DOOR INDICATORS SHOWING GREEN WITH THE EXCEPTION OF THE TOP RT INDICATOR WHICH SHOWED PART GREEN PART WHITE DURING CRUISE. ALL INDICATORS SHOWED GREEN BEFORE TAKEOFF, DURING DESCENT, MESSAGE EXTINGUISHED. INSPECTED R1 DOOR, FOUND NO DEFECTS. PRESSURIZED ACFT, COULD NOT DUPLICATE, OPS CHECKED GOOD IAW AMM 52-41-00.