Beogram 5000/5500 problems

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I have just ressurected a Beogram 5000 tuner/amp and 5500 CD deck,they have been in the loft for 7-8 years. Connected via 7pin din. Everything worked at beginning but now CD deck works from own buttons but unable to adjust volume as no buttons on amp appear to work ( remote master control dead, poss due to leaking batteries left in when stored). Power is on to both units though power supply is unearthed, would this effect anything?
Help!