Radio Lights

[Finapples]

I have a 01 Yaris in great condition. Recently, the lights on the radio have been playing up. When I turn off the ignition and take out the key the lights on the radio that say 1-6 (to choose saved radio stations) stay on. It has ran my battery down many times and Ive had to buy a new one lately. I need to jump the car very often. Its very inconvenient. I brought it to a mechanic yesterday and all he did was take the fuse for the radio out. So now I have no radio at all, no dome light and no beeeeeeep when I turn off the car but leave my lights on. Does anyone know a quick fix for this?? Th mechanic told me it would be a massive job ot take out the whole dash to check ot out fully. Im hoping not!