What was found
AFTER DEPARTING KDAL AND CLIMBING THROUGH APPROXIMATELY 4,000 FEET WE RECEIVED TWO CAS MESSAGES. AMBER CHECK DOORS AND THE CABIN DOOR OPEN CAS MESSAGES. WE RETURNED TO KDAL AND UPON INSPECTING THE CABIN DOOR ALL SIX PINS WERE SHOWING LATCHED AND SECURED. HOWEVER, THE AMBER DOOR OPEN LIGHT IS SHOWING ON. REMOVED OLD CED MONITOR PCB (P/N: 7497101-1, S/N:0506), INSTALLED NEW CED MONITOR PCB (P/N: 7468101-20, S/N 35148201-1) OPS CHECK GOOD. WORK PERFORMED IN REF TO CE-680A AMM 52-70-00