Agreed, but who makes heatsinks out of steel?
Oh yes. I replaced those in my model 3. All were swollen. I suspect these may have been under rated, voltage wise at 25v as originally built. I replaced the above mentioned 3 caps and all is well. However, when time allows I am going to replace all the caps in the power supply section and verify the voltages per the service manual.
Just be sure to remove the (soldered) ground lead at the right front corner of the PC board and remove the ground and possibly the power cable recepticle itself from the chassis before removing the board. Also, the RCA connector assemblies plastic housing are somewhat brittle. Be careful. All 3 caps are soldered to fairly large areas on the underside of the board and should be not much risk to the board itself to desolder and replace the caps. They are 10,000uF 25volt caps. I suggest replacing with 35v types.
They are aluminum. Some discoloration from another source is likely.
Gunk from the blown capacitors?
When electrolytic capacitors are unused for a long time, they tend to "reform" The working voltage goes down and the capacitance increases. Then you plug it in and turn it on and the capacitors overheat.
Reforming is not the process of degradation it is the method used to restore degraded capacitors to their original form. Hence the name.
Articles I have on the subject call both the changes caused by disuse and the method of restoring the capacitors "reforming" in opposite directions.
Well if that's the case that's very odd and nonsensical usage of the word, just type 'reform electrolytic capacitors' into Google. Hundreds of articles - not a single entry I can see that suggests that the term reforming refers to degradation.
That's not how Google works.
