Weight bearing walls & mold removal

We've successfully removed mold from our home everywhere, but one wall. It's a weight bearing wall. The bottom three feet is concrete and cleaned up well, but the wood framework above has a strong musty smell to it. We don't see any visible signs of mold, but think it could be hiding under the bottom beam which is ontop of the concrete. We don't want to remove the wall because it's a weight bearing wall and would be a nightmare. Any suggestions on treating the underside of the lower horizontal beams? We considered drilling several holes at the botton and spraying the mold removing solution in each hole, followed by drying it out and then spraying the anti mold, odor blocking primer next. We could also reinforce that beam with another ontop of it. Any suggestions? Thanks for your help.