Thank you. In 32 years I have had a single issue. A rattle from one of my (new) Subway 15 drivers. Contact with Boogie confirmed a likely fault and a new speaker was sent over. On removing the faulty speaker it was obvious that the issue was, in fact, a block of 4 staples that had fallen from the gun used to attach the wadding to the inside of the cab. I guess the chap fitting it had reloaded the stapler and not noticed these staples fall out into the cab and stick to the back of the magnet.
Bass Gallery (where the swap was being done) contacted Boogie who let me keep the replacement speaker! Very happy with that level of service. The guy at Bass Gallery also came in to the shop on the day he was due to go on holiday, in order to effect the repair.