From the Subaru board pics, this is a standard automotive TVS diode Nippon Denso used, in a 1980's button package which is obsolete.
It is protecting the dimmer board and everything downstream from overvoltage transients and load-dump. Very hard to blow one of these diodes. As you can see, the PCB trace fuses first. What happened to it? I think this board protects power for a bunch of other stuff.
It's a Japanese semi, the "T" might be Toshiba, but yellow lettering was Hitachi as I recall. It could be Sanken as well. I could not find the part number "S 5225" anywhere.
Modern parts are plastic, the standard is "27V" yet popular parts available are either 26V or 28V. The exact voltage value is not critical. I would use a
5KP26A (surge rating 5,000W) and make sure it can fit as it's 2mm longer body. Smaller (surge rating 1,500W) part would be
1.5KE27A OK if you don't drive around with a bad battery connection or have a crap electrical system.
Original part could be 3,000W like (plastic) ZSA5A27.
The damage to the board (melted traces) is due to pulling way too much current through it from a wiring mistake somewhere else.
The other parts are vanilla on the board if you need help fixing it.