Chris, I think Ken is on the road to a Bowl game and he'll be away until Saturday. Not sure he takes a computer along with him on trips.
Looks like you have lots of healthy roots there, but a few that are declining, which is pretty normal. If you haven't already done it, when you re-pot any more of these Phals, cut off any roots that are brown and shriveled. You don't really want rotting plant material in the pot to harbor pathogens.
This means that your yellowing leaves are more likely due to nutrient deficiency, not root rot or other outside influences. Is the soluble fert you're using high in phosphorus (the middle number of the 3) ? Too much phosphorus can bind up some of the other nutrients in soluble fertilizer. Are you by any chance watering with well water (high pH or also could be high in phosphorus as mine is).
Try just adding Epsom salts to your water for the orchids, and feed them by spraying the leaves (any pump spray bottle will do fine. About 1/2tsp. of Epsom salts to a quart spray bottle should be lots. Don't water the roots of the plants for a week or so to let them dry out and breathe. (you're about to get cold weather, so the plants will be slowing down and not need as much anyway).
I would keep that one you re-potted in a shady area and let it dry out for a few days. These orchids do like to dry out between watering, but not quite as much as other types.
