P4 Firmware Phantom 4 Pro camera functions not working at all

[Roadjob]

Sent drone for gimbal replacement. When I got it back, I had a functioning gimbal, and live image on screen. What I did not have is a functioning camera for video or still. All settings at top right read NA. The firmware is current and the drone fly's fine. But it did before the gimbal was replaced. In the aircraft status column it says that the gimbal is disconnected?? The drone itself is flashing green and red in the rc connection pin hole spot. Cannot seem to find an answer. Looks like either something is not connected but cannot get an answer from DJI Drone Service who repaired it...need some help.