I'd open it up and see what part failed first.

Mine ate my replacement regulator. The motor is fine, but bound up by the reg and doesnt make a sound when either set of switches is pushed.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)