My Servowarm Elite 50, 30 years old, has just been condemned at its annual service. The boiler works perfectly ( the engineer admits this) but was failed because the combustion cover had sealant and not a gasket/seal fitted. This boiler has been serviced every year since new and no one has ever mentioned this before or, as far as I am aware, ever replaced a gasket with liquid sealant. Does any expert out there know if the bead of sealant was the original standard fit rather than a gasket on early models? When I think about it he didn't say it was actually leaking, he just didn't think the sealant was right. Am I being ripped off by having to buy a new boiler?