We just had our Shower Pan replaced under warranty as it had a few cracks in it. The dealer did a terrible job (But thats another story).

Anyhow, does anyone know how to replace/remove the pop pins/plastic rivets which hold the shower wall enclosure to the wall of the RV?

The dealer must have just pulled the wall away to allow them to replace the pan, in doing so they broke the heads/washers from the pins. They tried to silicone them back on, but it looks terrible, and one of them has already fallen off. I can tell that one of the pins is still attached to the RV wall, but the other one doesn't seem to be holding the shower wall anymore.