2003 Sundancer 240 - water leak around shower sump pump

[ComeFriday]

The lower floor inside has been getting wet from below the step where the trash can is and I can't figure out where the leak is coming from. I have replaced the shower sump pump under the step and it has made no difference. There is standing water around shower sump. This has been going on for 3 years and my mechanic can't figure it out either (he replaced the shower sump pump last year). What else would drain into this location? Thanks!

 

[Lazy Daze]

Portlights... shower drain... stanchion base plates... all of these things can leak and have water show up outside the sump box.