HVAC push button repair on Gen. I W126 would be awesome.

I bought a new one 5-6 years ago and it broke just recently. If I press the middle or second from the right button, the fan doesn't kick on. I've got to press the fourth from the left button to get the fan to kick on and then click EC or the middle button if I desire those settings.

Based on what I've read on the forums this is a common problem with the units. I got a few from the yard to try out and they all exhibited the same problem!

I've tried soldering numerous times on two different units with no success.

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1984 300 SD 384,000 Miles