My 2014, 4900 with the bed ,table setting has a little black metal box underneath the left hand side part of the bed where the fuse for the...
I think one reason is you are carrying now the weight of the lifted axle too
I had the same problem on my vt 830 I used to have and the volvo dealer i stopped by then replaced the parking brake switch, switch did cost less...
I had the same problem, a couple weeks after turbo got replaced on a d16. Loud whistle turbo noise at about 30 psi, in my case after several...