Salon lighting

1) There is a six conductor wire going to a five pin connector on that lighting board.  It appears the connection on the far right is broken or shorted.  This appears to be the power line.

2) On the board in the boat currently, the voltage at the circled red area appears to be 5V.    The fuse, however (T750) is open (checked with all plugs out).   My guess is that the fuse blew when the power line shorted.   Was able to get the original fuse, but will have to use the extra conductor to bypass that power line.   My thought is to rig up the fuse temporarily with some alligator clips to make sure it works before soldering it back.

3) On another board, the fuse is OK, however, that voltage is zero.   Capacitors check out, however, when powering up with 12V, 12V, not 5V appears.  Replacing the voltage regulator didn't help; it appears the two smaller devices (in yellow) have different characteristics.  

Doing a search on "Why would there be diodes to ground in and LM7805 circuit?" (The LM7805 is a standard 5V regulator, not necessarily the one you see in the picture), a few answers popup; https://forum.arduino.cc/t/using-diodes-in-lm7805-design-circuits/921152 is one of them, but the canonical answer is probably here:

https://www.eevblog.com/forum/beginners/lm7805-backfeed-protection/

... which shows the datasheet https://www.ti.com/lit/ds/symlink/lm7800.pdf.

The upper yellow circled widget seems to be shorted, which is a usual failure mode for a diode, but it isn't clear, without a wiring diagram, what the replacement might be.

Do you think this boardis the same model/type as the one in my picture?

Do you ahve the actual model number of it, if ordering a new?

They seem to be below 50€ cost.

Hanse Yacht does not have them, and reconmend to buy new, which is 450+295 € as also the remote needs to be replaced.

If anyone knows where to buy the PCB print (ABL Sursum SLS F ) Then please share.