KAM KCD990 twin CD player - faulty. .

KAM KCD990 twin cd player, twin cd, control panel and lead to connect them both. Selling cheap as one cd is skipping, jumping. Could just be a simple issue of it needing a clean but I do not know and do not want to mess about with it. Was working fine up to a month ago but had issues since. Both screens work and second cd working fine.