Well I thought I foamed everything shut and went out early this morning and there were mouse dropping again. I started up the engine to see if it would stir anything up and it did!! I saw the critter go down the slot where the driver's side seat belt retractor is!!
I pulled off the sill plate and boom, much to my surprise whoever ran the wiring harness through the OEM hole just pulled the grommet out ran the motorhome harness through and left it like that (see picture).
Of course I slit the grommet, inserted the motorhome harness and taped the grommet back up. Problem solved, but not after having mice dropping and what not all over the motorhome and I'm sure that's what cause my issue with the A/C unit blowing little pieces of foam!
Best we all inspect this and make sure it's corrected if done this way.