[morzh]

Good thing is, you won't have to do much if it works. Maybe (not even sure - it is a battery radio) an electrolytic or two.....(Ii did not look up the sch).
You perhaps will have to clean / lubricate the pushbuttons.

Which is nothing - older radios like VEF used drums with gozillions of those silver-coated small spherical contacts against leaf spring contacts, also silver coated, and those oxidized like crazy. They used the same technique in TV "PTK" (russian term) block (the channel selector) and boy did they give grief after a couple of years, especially when the blocks were made from sulfur-containing plastics.....