Just a thought, have you had the plenum top off and checked that all the trumpets are in place, have heard that they may come loose and rattle away in the plenum chamber, good luck and Merry Xmas, regards Frank.
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Just a thought, have you had the plenum top off and checked that all the trumpets are in place, have heard that they may come loose and rattle away in the plenum chamber, good luck and Merry Xmas, regards Frank.