To give a little back story I have a 2013 g37 sedan. Had the infamous sunroof leak on the passenger side and replaced the grommet on the fire wall thinking it fixed the issue. A year goes by issues that was intermittent: turn signal stop working, wipers stopped working, hazard stopped working and alarm randomly going off. so i checked and noticed the pass floor is wet and can see water on the bcm, so i removed the water and completely dry the passenger side and bcm. I let the car dry for a week and followed some suggestions on this forum to run sun roof drain with new hose and tap into the ac drip line in the floorboard. I did this a few months ago and with all the Florida summer rain I have had no water enter the vehicle on either passenger and driver side. well about 3 weeks ago my vehicle parked in the garage off my phone was connecting to the cars Bluetooth and noticed the info screen/radio was on while the car was off and not in accessory mode. turn on and off the car to turn the screen off. The next morning radio was on and i couldnt turn off the car or turn it on. I unplugged the battery searched on here and removed #19 fuse(audio/mirror) on the driver side fuse panel and charged the battery back. I left it for two days put the fuse back in and back to normal until a week later notice my phone connecting to the car Bluetooth and the screen is off and the battery was drained. so clearly something is staying on in the car causing the battery to drain.

So with all these issues and knowing the bcm did get wet prior I'm thinking i need to replace the BCM. So I have the following questions:

1) I'm looking to replace my bcm part number 284B1-1NC7C with a new one. I was able to find a new one at a Nissan dealership locally for less then $500. As long its the same part number it shouldn't matter coming from the Nissan dealer correct ?

2) my understanding the keys need to be programmed to the new BCM. Is that the only thing that needs to be programmed to the BCM ? I found a local mobile locksmith who confirmed they can program the key fobs to the new BCM, since i can put the new BCM in myself.

Any other suggestions or information would be greatly appreciated.