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Just to add, these seven relevent capacitors are generic electronic components. They can be found in all manner of electronic appliances and devices, from computers to cars to kids' toys. Over the years they eventually weaken and fail, even when not in use, and probably more than any other electronic component, and would often be the first components a technician would check. These parts cost cents. An electronics technician or skilled hobbyist could test them for you for a small fee.
I worked on an older model and its capacitors were fine even though it was an older model. So it's possible the particular capacitors, or in a particular batch used in the later Ambery TBC-1 were substandard and had a shorter working life. Possibly this has given these units a bad reputation amongst those who dont understand how relatively easy it is to test the capacitors and, if needed, replace the faulty ones. As I mentioned, out of the seven, I only replaced the two caps which measured weak. That was some years ago and the remaining five capacitors are still fine and the unit still works as good as new. Even so, I occasionally check all seven caps.
I'm not saying these caps are the cause of the crosshatch pattern in your case but as a technician and given my experience with my own unit, testing or having tested these relevent capacitors would the first thing I would do. If any measured weak I would replace them, even if the unit was still performing well as it would be just a matter of time before the failing caps started to affect performance.
Nobody else on this or the other forum has even mentioned these capacitors which surprises me as I believe there are people on both forums with electronics experience who know how commonly electrolytic capacitors can fail in older electronic equipment.
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