[rfuerst911sc]

Please clarify: the new parts that they tried as part of the diagnosis that didn't solve the problem did they leave them installed ? Or did they swap your old parts back in when the new parts didn't fix the issue ?

If they left all the new parts installed then maybe negotiate a reduced rate based on they didn't fix the issue and its been 10 months . And tell them you will pay for one service call .

If they want to be considered for your future business they should be willing to negotiate . Remember just like you they are in business to repair equipment and in this case they didn't/couldn't .