MAN TGL reversing light is not switched

The reversing lights no longer work when you start the reverse gear. It is an automated gearbox that inserts the R only when the engine is running – so of course I have the engine running … The following error messages have accumulated: EBS 03515-02 FFR 03201-08 INST 08112-04 ZBR 04002-04 ZBR 04001-05 ZBR 04006-02 TCU 00161-08 The EBS error is the only active error and has to do with the current date. I can’t find a fuse for the reversing light circuit – it’s not broken either. Where can I start looking before I put the bowl to MAN, which then replace for 3-5 k€ cross-over wire harnesses and modules, until it still doesn’t work.