hope someone can help. we have 2018 530 with an HK sound system. Everything worked fine until water got into the amp. Brought it to the dealer (attached what there response was) dealership wanted 3500 to swap the amp out. so Instead of spending 3500 I ordered an HK amp online. simple plug and play install but still no sound no door chime or anything. I checked fuses under the passenger foot well and the right trunk but seem to be a mystery on where I can find the relays for the load line. I know the f10 I think it was under the carpet by the seat but cant Seem to find any wiring diagram or info on this anyone have any clue?was)