Roland CR78 Drum Machine - Help Wanted!

Hi, can anyone out there please help us to fix, restore, repair a Roland CR78 CompuRyhthm Drum Machine please ? It used to work …but was stored away and unused for many years…now when its plugged into mains and is switched on …it powers up…some small red lights light up on the front of the unit… But no sounds or beats are coming out of it …can anyobe out there help us to sort it and get it back to useable and working condition please ?
Any help appreciated !