The failed caps look EXACTLY like devices which I found had a likelihood of catastrophic failure while working on PCB assemblies at my last job.
The devices were tantalum caps of various values, dipped in orange epoxy, which I expect meant they were Sprague manufactured. Whenever I would get an assembly in for repair which had these installed, I would remove them all and install new ones before even applying power. Prior starting that practice, they would randomly blow as soon as power was applied to the test rack. Sometimes, the boards would come in with them already blown, which was the reason they were sent in for repair in the first place. I replaced them with Kemet devices and never had any problems after that.