Wow, thanks for posting code descriptions and other data. Many others post a string of code numbers and say " fix my car for me " then sometimes get irate when asked to take an active role in fixing their car by doing some research.

Eb1235 - Emissions sensor (B31) looks at outside air quality. Do a quick search on this site as someone else had an issue with this.

Eb1231 - ETC sensor (B11/4) looks to be Engine coolant temperature sensor. Do a code scan of the engine computer, this code might have originated from there. Given the 6.ECT sensor data values, things look OK.

7.Refrigerant Pressure in bar: 06, 12, 08, 09 looks OK based on what I remember from my 97 SL320 and 97 C280. I'd install pressure gauges on both sides of the AC system. You might have a stuck expansion valve that is limiting freon flow / worn AC compressor.

3.Left heater core temperature: 32, 61, 08, 07 4.Right heater core temperature: 32, 37, 07, 05 This shows that the heater valve isn't stuck open while driving. Be aware that the heater valve defaults to open when power to the valve is dropped, this is why the engine off heater core temps rise.

Have you checked the cabin air filter?