^^^^^^^Jesus H. Christ. I'm sorry next time I whip out my electrical engineering degree and ask my 20 year certified BMW Mechanic who was trained here and in Germany for a 15 page dissertation as to exactly how he tested my vehicle and why he came to the conclusion he did since no other signs pointed to any possible malities. I just hand him the goddamn keys and say "Tell me what's wrong and let me know if I can do it." then throw him $60 bucks for his time and get on my way.

BTW you are not using the word grouse properly.