Disco 3 (LR3) Sat screen on and radio but not working drained battery

Working on Disco 3 I have removed glove box ... just about to remove PCB board so l can replace end on drainage tube front near side following flood in footwell !!!
Rain stopped play so had to reconnect battery ... now So ... have removed glove box ... just about to remove PCB board so l can replace end on drainage tube front near side following flood in footwell !!!
Rain stopped play so had to reconnect battery ... now have sat nav screen on and radio screen both not functioning!!
Car starts everything else works ... for now !! Is there a code for radio ? Nothing in service book ? Dash lights as mentioned still on this morning !!
How do u reset ? Any help greatlyappreciated want to resolve before I movePCB and replace drain tube end sat nav screen on and radio screen both not functioning!!
Car starts everything else works ... for now !! Is there a code for radio ? Nothing in service book ? Dash lights as mentioned still on this morning !!
How do u reset ? Any help greatlyappreciated want to resolve before I movePCB and replace drain tube end... battery flat this morning

Update ... can’t remove PCB board !! My hands are just to big, managed to remove 3 connectors from front of board !!! So done for the day !! Battery on charge ... roof to be taped up and book into independent !!
Unless there is anyone in Warwickshire that has replaced drain tube end to front passenger side on a Disco 3 ?