Combination Switch

[ED C.]

Last evening while using the high beam flash function on my 88' 300TE I suddenly had smoke rising from the column. The combination switch does not flash the high beams any longer. All other functions work properly (High Beam, washer, wipers, signals).

I just had the evaporator replaced two days ago. The tech claims he did not remove the wheel, just the dash. Is this just a coincidence? What could have been done while they were in there to effect the combi switch?

How detailed is the R&R of the switch?

Thanks in advance.

Ed C.