What was found
DURING CLIMB, THE SERVICE DOOR OPEN RED EICAS MESSAGE ILLUMINATED. PERFORMED QRH PROCEDURE, AFT SERVICE DOOR, ACFT LT SIDE, STATUS PAGE SHOWED X. PRESSURIZATION NORMAL. ALL DOOR INDICATIONS GREEN. MESSAGE WENT OUT AT 10,000 FEET. R & R L2 DOOR FRAME PROXIMITY SENSOR IAW AMM 52-72-21. OPS CHECK GOOD.