Dover Composite problem

Hey guys,

Working on a composite and it will not latch calls. My FT board light is on. Pretty sure I’ve checked and cleaned all the contacts in that circuit. If I pull in on UA and DA it will go? If anyone can point me in a good direction it would help. Thanks

Assuming the car is not on Phase 2 fire service. Check if the is a CCO relay. It has a contact that breaks the SP+ connection to your call call stack