How do I remove the large panel (72"x18") from the tub so I can access the plumbing? Can I cut the whole thing off and replace it with a tiled panel? The only access panel is in the closet next to the bathroom. It opens up were the pump is. The faucets are about 60" from that panel. I don't know the brand but it was put in by the builder in 1992. Thank you for your help. Dimmi.