Pioneer's top-of-the-line M25 power amplifier with cooling fins, suddenly becomes junk??

High-performance power amplifier with cooling fins and four large-capacity capacitors.
This is a rare item that rarely comes up for sale, so thank you for your consideration.
- Class AB M25
- Model Name: Power Amplifier
- Cooling Fins: Yes
- Capacitors: 4
- Terminals: 4
- Color: Black
Original retail prices were ¥200,000 for the M25 and ¥120,000 for the M22. (They look the same externally.)
This unit has seen very little use. It was then displayed as an object, so there are some scratches due to dirt, paint peeling, and age-related deterioration, particularly on the cooling fins as shown in the photos.
It will be sold as-is, so please take care of any maintenance yourself.

I haven't used it for a long time, so I'm not sure, but I was confident it was okay. However, the first time I turned it on, the power became unstable as if there was resistance, and suddenly the switch lamp went out as if the fuse had blown. It has suddenly become a junk item. I will sell it at a low price. Please request repair from Pioneer.
Initially, I was thinking of a price of ¥110,000, but since it's a junk item, it's now ¥30,000.
For your reference, I used Pioneer's largest speakers, the CS-955.
Depending on how you use it, it can be used as either a pre-amplifier or a main amplifier.
There is no instruction manual, but since it's a power amplifier, it's not too difficult to use.
The original box is not available, so it will be shipped in a box from a different Pioneer product.
Please refrain from returns due to the weight and comments!
Please consider carefully before purchasing. Immediate purchase is OK.

Thank you for looking.