Been there done that-just get another one. They are infamous for burning out the circuit boards. I posted pics of mine when it went and there are other threads regarding it. Don't mess with it. Just get a new/used one. Easy to replace.

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Dave S.
Northeast
2003 4.6is
2005 E53 4.4
2003 E39 Msport(a REAL ONE!)
1959 Fiat 600