"The pedal preamp circuit has an internal charge pump which takes the 9V input up to 36V - a LT1054CP opamp is used as a voltage regulator, and the core tone-making components appear to be 7 x 62P SMT type JFET Transistors."
Googled a bit, does that mean J201? Max voltage seems to be 40V for those so I guess 36V would still work. If it's a LT1054CP and J201's, then shouldn't be any too hard to find parts. 8 pots and 3 switches is a lot though.