green bullet problem

I have a reissue green bullet that kept cutting out on me.  I brought it to a local electronics guy who "fixed" it so it doesn't cut out anymore.  The problem is now it doesn't have any warmth, pep, guts.  It's wimpy sounding as can be whereas before his repair it at least had that great bullet sound even though it cut out frequently.  Does anybody know, did he drop it or rewire it wrong?  If he rewired it wrong how can I fix it?  Thanks.  Tim Q

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