Can smell mold but can't find it

Found it! We had an unused dishwasher in our rig and I took it out and replaced it with drawers. I left the pipe without blocking it thinking that the turn-off valve would keep the pipe from leaking. Not so. The pipe, which was snugged up against the inside of the kickplate leaked, ever so slowly, and the kickplate, made of plywood, soaked up the droplets by capillary action. There was no evidence of dampness when I looked under the drawers, but I missed the water soaked and delaminated kick plate. I ripped the kickplate out and used a heater to dry things up. Next will be to buy a plug for that pipe and install a new kickplate. Life is good.