Recently acquired a 2005 Coupe with 45k miles that had been little used in recent years. Looks like it has suffered some water ingress that has interfered with electrics - I have recently replaced the Engine Management Control Relay (A 170 545 03 05) which has resolved many of the issues, but a couple still persist.

With key removed, the driver side external lights are on. With the key in and turned, the right arrow indicator is stuck on in solid display on the dashboard in addition. If I remove the 35 position fuse from the fuse box (is there a better name for this component?) it lets me leave them off so the battery doesn't drain. I am aware the lights **** must be in the fully off position as single sided external lights are a feature on the car. I have tried the switch in every position and it works as intended except for the single sided lights feature.

Additionally, the radio is stuck on when the car is on and doesn't display or allow me to turn off. The rear spoiler motor is flashing red on the switch and doesn't work but unsure if this is an issue with the motor or with the fuse box as well. Do I seek to replace the fusebox? I believe it is the set of components outlined in this diagram but I don't know what the ID number for the whole fuse box would be. Thank you!