IIRC one of the KJ 985 OCs has that problem. Loud gas leaking sound
can be heard every half a minute.. Another KJ 970 OC (SMB90A) has
the same problem as well some time back when I saw it, don't know
if it has been fixed or not (unlikely I think given that nothing
has been done to the KJ 985 OC since WAB-ed).
SMB78L was also like that though fixed already
