[B and C]

Noticed the carpet between the lower two steps coming into the coach is wet.  Checked both bays on either side and they were dry on walls nearest to step area as well as floor..  There is a black box on the forward wall in bay R4 with what appear to be flex heater hoses coming out of it.  Next step is to tear into the box and see what is going on. Oddity is I cannot find any wet area on the walls of the step.  Thoughts?  Pictures when I can get to the Coach.
Thanks