You tried fitting a suppressor across the horn?
Used to have issues with tech's not changing the horn / replacing the suppressor when replacing SKF encoder bearing's on BT Rolatruc equipment.
Tech's found out the hard way as BT would refuse there parts warranty claim when the new encoder bearing failed shortly afterwards if there wasn't also a new horn / suppressor listed on the original job card.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.