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I understand the your Meile CVA4075 is showing you an F73 code. This code means that the brew unit needs to be cleaned. Here is a link to the owners manual on page 40 it shows you how to manually remove and clean the brew unit. The other issue you are having with the milk and coffe not being hot enough could be to the machine needing descaled.
Turn your machine off. Close the door. Depress <clear>, holding it down, press <on/off> then let go of both. Then press <clear> 3 times. On 3rd time, hold it until Service menu appears. Select <brew unit> then press left arrow to turn from <off> to <on>. Then press right arrow by <select> This will turn your brew unit drive to the correct position and you should be able to get your brew unit in/out and your waste container back in. Make sure to turn your machine off/on again to get out of Service Menu. I have a picture of how the wire needs to be inserted to get that back on. It's definitely not intuitive, but send another note with your email address and I can send the pics.
Remove the Brew Unit from the maschine and clean it very well und running water. Thn go into the Main menu and switch back all settings to factory defaults. Then take a vaccum cleaner and put the pipe in the small hole where the coffe falls into the brew unit (knock a bit on the maschin inside). Put out the bean container and do the same with the hole where the beans go into the grinder. Then put everything back in and start a cleaning process for the brew unit (do it 2 times). After that your Problems must be gone. The Problem is between the grinder and the brew unit. the grinded coffee has bee stuck and is not falling into the brew unit .... that happens when you use beans with lots of oil inside .... or coated beans .... they "glue" the chute .....
It sounds like the connector or wiring that links the LCD display board on the door to the main PCB inside the coffe maker has become loose or damaged.
This would cause the text displayed to become scrambled.
Its a 26 way connector that is labelled JP16 (on the next model up) and is next to a large IC.