I pulled the HVAC controller out and it smelled burnt. I pulled the circuit board out and found a burnt spot. I have a spare controller that would not bring the blower to full speed which I installed and the same area burned. I have no idea on how to find what is wrong. On the board the legend shows that C67 and R126 are involved. Can any help with this or recommend a knowledgeable repair source. Does anyone out there need a parts car?

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1984 300CD (sold)
1973 220DPK 4 spd (died)
1978 350SL 4 spd gray market
2003 SLK32 AMG
1988 300CE (sold)
1997 E420 (Totaled)
1998 E320 Wagon