Opening/Repairing of Polar Vantage V2

I‘m trying to repair my Polar Vantage V2, as it has some electrical issues (display errors and unwanted button behavior). The watch is waterproof, which means the parts are most likely glued together. The watch doesn’t have to stay waterproof after repairs.

So far I only saw one screw on the side. Removing it did nothing. I also baked the watch at 80°C and 105°C for about 10 mins each in hopes it would soften the glue enough. I tried to use a suction cup to pull on the display, but nothing moved. I tried to put something between the case and display glass, but the gap is just too narrow.

I think increasing the oven temperature might end up in a damaged battery or display.

Any other recommendations on how I could open up the watch?