Grohe, Help with Shower Handle Leak

Hi there! We purchased a new home about a month ago and I noticed a leak in the ceiling coming from the master bath area. We hired Oliver Plumbing to come out and the person suggested we just re-caulk the shower/steam shower... 190 dollars later and no real help... I did this and it obviously did not solve my problem. I decided to cut into the wall and remove shower handle faceplate to see what was going on. Sure enough there was a leak coming from screws on the left and right side of the handle. See image with 2 red circles... When I took this apart it appears that the screws have holes that allow water to pass through??? Looks like this was on purpose. I am at a loss on how to fix and any info would be appreciated.

It seems like this is a handle to a grohe 28206 brass shower head... Am I looking to replace the grohflex control module? Not sure if anyone has an idea on how to find part number. Thanks!

 

This is a link provided by Terry on an earlier post. The parts you need are # 10 on the breakdown. part # 08355. The hole on these is for the escutcheon screws.

https://terrylove.com/pdf/grohmix-tpi34436.pdf

 

Thanks so much for the quick response, really appreciate the help! To confirm, does this look like the correct part? difficult or fairly easy to install?

https://www.amazon.com/GROHE-AMERICA-0835500M-Piston-Assembly/dp/B000QA9KT6

 

Yes, That is correct.