I have been working on stuff for almost 50 years and I just had my first shorted disk capacitor. (those flat brown ceramic looking things) This was a stereo amp blowing the fuse. I fairly quickly isolated it to the power supply section and knew it wasn't a diode or the transformer. That left me with 2 big electrolytics and 4 disks. I took out the electrolytics with no joy so I decided I would just 'smoke it out". I put in a 6a slow blow and ride the glow if the element in the fuse with the power switch until I saw one of the disks changing color and figured out it was an internal bolted fault.
The numbers on these were undecipherable so I just found one in my junk box about the same physical size and went with it .
Fixed another one.,