I've Roltechnik Hawaii-P 900 (acrylic) shower tray (18+ years old) and I'm wondering if it's possible and how to lift it up or remove it without destroying it or cutting it, so that maybe I can place it back once I'm done inspecting underneath it.
I don't know how these are/were installed or maybe they're always meant to be glued in with PU (Polyurethane) or (unlikely) silicone ?
I've already removed all silicone from the wall sides, but it won't lift more than 1 mm (let's say) due to flexibility I guess.
I see one PU foam blob and a rectangle of PU foam most likely as part of the underside of the shower tray from the factory because they have a picture here of the underside that implies they're in a grid like that. I'll include pictures. I can even see a ceramic tile and cement under there.
Drain hole pics are here






