It is kind of annoying that they numbers the transformer primary terminals on the schematic symbol, but not the secondary terminals.
I think it is a fair assumption that the secondary terminals are in the same order as the schematic, and if so seeing the two wires that head off away from the PCB on terminals 11 & 13 make me believe those are the ones labelled "heater" on the schematic.
That then leads to terminal 7 & 8 (orange & yellow) being the 11V AC winding, and terminals 9 & 10 (green and blue) being the 15V AC winding.
This matches up with the PCB layout, with orange and yellow terminating near D201-204 as on the schematic, and green and blue near D205/207. Purple wire being the heater centre tap also makes an appearance in this area as you would expect from the schematic.
Easy to confirm with with DMM, keeping in mind the AC voltage will vary with input voltage and load - but the difference between 11V and 15V winding should be quite obvious.