PH - BQA 17 May 2015, 2:51 pm #198 PH - BQA PH - BQA PH - BQA Posts: 4239 Threads: 20 Joined: Apr 2014 Reputation: 0 RE: Arriva North East: Latest News & Discussion - May 2015 Drove past 7524 earlier and it was making a very loud whistling noise, any ideas?