Why is this happend?
The stuff you are seeing on the side of those capacitors is glue. I would advise that if the glue turned color, it may have warmed up, or it is just old glue. If in doubt, those are not expensive parts, they can be replaced along with others. A bad cap will usually have corrosion on the leads or a puffed out pressure relief plug in the bottom of the cap. These probably aren't bad, you are just seeing glue used to hold them on during the wave solder process. If you are buying used and the amp works, this is probably not a problem. Caps are inexpensive parts.
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