Shower surrounds are notorious for leaking untill you get every minute gap sealed. I even found one that did not leak for quite some time after showering. Found that when the surround frame was installed that they did not use any sealant on the screws going into the shower pan. Good luck and keep us posted.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7