Tannoy TS2.12 PSU repair

Hello,

I have a Tannoy TS2.12 dead. No power, no led light. I took the PSU out and I don't have the standby voltage at all. The PCB is double side, very crowded and difficult to fallow the tracks. Are the schematics of this PSU available somewhere ?
In Primary I have 314 volts on big capacitor and nothing on input of KA78R15 which I think is for standby voltage? What can I check next?


Thank you and Kind Regards.