I've just received the following information from my repairer regarding the -15V DC Regulator, and Technics spares in general: "Technics used a KIA7915 (made by Kia). Any other branded part seems to work fine. Technics don’t make the part so any reputable supplier should do. As far as Technics parts being available. Some are ... some are not. Basically we try to order what we need and see what happens. Technics do offer a PCB recycle facility in Japan where they repair / refurbish the faulty boards. This is available only through Panasonic agents. You cannot go directly."