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If it's like mine it's a pressure switch in line, around the transmission cover. You could do it yourself but would probably have to bleed the brakes after the change out. Don't know what the switch costs but $95 might not be too bad if you're not into the mechanics of these things and have a service manual.
Gman ..... Part cost's $21 so i guess i will try and download and give it a go i think my dealer has had enough holidays's on me .... Thank you for your reply!