2003 Mercedes-Benz CL55 AMG Questions

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I just bought the car and need to register it so it needs to be smoged
had to pass a semi on a two lane and when I lost power it got interesting. I floored the accelerator and it didn't respond. the car keep running but no speed. the semi had move to the shoulder. I had to come to a complete stop turn off key before car would accelerate normally.
Heard it knocking when I pulled in garage last night. Shut of car immediately. Checked all fluids. All good. Started car in am, and knocking kept going for 30 seconds and the suddenly stopped. Drove car around block and all seemed good except no cool air. From my research, AC Compressor shot??? Any help anyone can provide would be greatly appreciated. I can buy a new Denso from Parts Geek for just under $300.00. Labor cost? Anything else I should know? Thank You
this has occurred twice since I had this service done. is this a possibility that this service had something to do with this problem? I have a year old battery and this problem never occurred before. I put a 1 hour charge on battery and all systems go.
Now we have a loud squeall either on one or more just before you stop. visually everything looks good. there was a damaged rotor on the rear driver side..and now that rotor is showing shinny circle on the rotor itself but no grooves.
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