No console/dash lights

This morning when I started my 91 300E I had no dash or console lights, they were working fine last night though. I changed a couple of the fuses (slot 3 & 5) to no avail. The other items hooked up to these fuses work fine; tach, parking lights, fog lights ect. Where do I go from here? Is it DIY? Burnt out buld or busted dimmer pot? Grr, I've had this car for 7 days and already the muffler fell off, headlight lens cracked and now this. (Muffler replaced @ no charge)