Not to scare you Hey Jude. Check the caulking around the surround and the shower pan. My pan had spiderweb cracks after the family stayed a summer and that winter turning on my heel it broke. The guy did a decent job out of Brighton,MI. After a couple of months the water would seep thru. Not hard to dissemble about a dozen screws. Hard to hold the panels by yourself but can be done.
That's why I believe their is no caulking on the top of the surround. It's just really a brace to hold the three panels together.
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