Leak Troughline stereo decoder

"I have a Mk2, ally front mono version that I haven't used for a couple of years. A couple of questions: Are the caps likely to be in need of replacement, if so what replacements are recommended? Also what's the feeling on decoders? Which are worth having? Is there a DIY alternative at all, as I fancy getting the iron out again? If anyone has any other comments, I'm all ears. I have used the thing, it all works but I'm fairly sure it's in its original rather battered and scruffy state so 4 new caps might be a wise precaution before the rectifier gets fried ."

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