Dash lights

I recently got a 1986 900 it's in great shape but the lights on the heater controls don't work. Can anyone tell me how to fix the problem? The lights on the push button switches below the heater controls also don't work

You've got to take the floor mounted center console apart in order to be able to remove the side trim panels on the upright center console to access the rear of it to check for loose wiring harness connections that the p.o. may have knocked loose refitting the radio or..., you just need to change out a burnt fuse ? (I'll cross my fingers for you that it's the latter).