What was found
AFTER CLOSING MAIN CABIN DOOR WE RECIEVED A CABIN DOOR OPEN CAS MESSAGE . QRH DOOR RESET PROCEDURE DID NOT RESET CAS MESSAGE. WHILE HOLDING THE LT CANCEL BUTTON FOR 15 SECS, DID NOT GET CHECK HANDLE, PUSH TO OVERRIDE FLASHING LIGHTS. ACCESSED ACFT. REMOVED SUSPECTED DEFECTIVE DOOR ROTARY SOLENOID, INSTALLED NEW ROTARY SOLENOID, NO DEFECTS. RESTORED ALL ACCESS GAINED. CONNECTED MAIN BATTERIES. CONNECTED GPU. APPLIED POWER. PERFORMED CABIN DOOR RESET PROCEDURE, NO DEFECTS. PERFORMED DOOR OPS CHECKS, NO DEFECTS. PERFORMED MULTIPLE CYCLES, NO DEFECTS. REF WORK IAW AMM 52-70-15 / 52-10-00 / 24-30-01 / 24-40-01.