Has anyone who owns a C70 had their ETM replaced per the Volvo recall? If so, how much difficulty did the dealer give you before they agreed to do it?

I own a '01 C70 that I purchased with 30,000 miles on it three years ago. About 1 1/2 yrs ago, I had the symptoms associated with an ETM problem and so the dealer did the software upgrade and the car ran great for a few months. Then back to the same surging, stumbling, etc. When I took the car back to the dealer, they would not replace the ETM but said that I needed to have a throttle body cleaning for $90 as the next step before they would consider doing anything else. Now several months later, I am back to the surging, stumbling, etc.

I had my independent Volvo mechanic drive the car this week while it was in for service and it was fine at the time and no codes had been thrown.

One it starts acting up again (and it will), I plan to head straight to the dealer. Can anyone on Brickboard who has had this experience tell me how you handled it and what suggestions/approach you would recommend to me. Thanks, Fred.