@
edeekeos you have said it's not the rear deck but sometimes these noises aren't that directional.
Here's a fix I came up with that fixed all the noises I was getting from the rear of my car. Only takes 30s so worth a try and even if it doesn't fix the loud noise might fix the feint one you have
http://www.ft86club.com/forums/showthread.php?t=42065