On my unit, I can access the shower drain piping from the main bay. There is about a 4" hole through which can see up to the tub. I can feel where it is supported and where it is not. Additionally, I have Dianna walk around in the shower to see where it sags.
There is a strap holding up the piping from the shower orifice and the "P" trap. Mine was too tight causing the pipe to rock when pressure was on the floor. That rocking will eventually cause a leak from around the drain as the plumbers putty gets squeezed out. I also loosened the strap about 1/4"..
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