Just out of curiosity...those that have this issue...do you touch your buttons often? I only ask because it is so rare for me to touch any of the IHKA buttons because I let the AUTO feature do its thing. It's only on rare occasions like the MAX button during a heat wave...or the REST feature when doing short errands when its really cold and the heated seat button. But the fan and temp speed buttons rarely get touched. Again, just curious to know...and not for any condemnation.
Here's a link to the TIS website that gives instructions on how to replace the IHKA buttons:
https://www.newtis.info/tisv2/a/en/f...ols/1VnXKCffWs
Do note that there is a special removal tool (00 9 340) that facilitates button removal...but the tool can probably be easily fashioned from something you have around your home. Here's a pic below of the tool...and if you click the link above to the TIS website...there's more images: