Date registered: Dec 2005
Vehicle: 222.132 & 221.122 & 212.025 & 906.633
Mentioned: 3 Post(s)
Quoted: 32 Post(s)
Would be nice to see photos, the OP talks about replacing bulbs while others talk about a single bulb.
It it is the single DIN sized (like an old radio by size) push-button control unit, then it should have a bulb at the bottom (unit needs to be removed with radio removal tools) and this bulb is intended to be serviceable. Actually if any device has a filament bulb, it must be designed to be serviceable.
If the AC (not CC) unit is different from what I'm assuming, I hope others got it right.