My first thought was european foulbrood and maybe it is, but I am starting to have doubts. I noticed the last time I was in the hive about 2 weeks ago I started seeing spotty brood and was suspicious. I had also recently noticed their numbers seem to be dropping. I had a min to give it a quick peak yesterday in a couple of frames. It was very spotty and dead larvae in some cells. I got in it today and pulled all the frames of brood and replaced the with new frames and pinched the queen to replace her. As I have the frames in my basement I noticed some of the larvae slowly are expanding out of their cells. Looking closely at the frames now I am wondering if it is something else. I don't really see any issues with the adults. I did the toothpick test to many cells and never had any roping. Some of the larvae is maybe a little yellowish. Most of the dead are laying straight out on the bottom of the cells, and others died earlier and are still in the c shape. Any ideas to what this is?