FireFly has problems with indirect light with indoor scenes. You can try if the splotchies go away when you raise the settings for indirect light, additionally you should take care that no light with inverse square falloff is really close to a surface, since the reverse falloff is calculated from a distance, everythig closer is lighted extremely bright and makes splotchies too.

Using SuperFly will get rid of these problems, but you will need to redo the materials,to get a good result. Superfly has no problems with point lights and indoor indirect light.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.