Ibanez PH5 phaser schematics?

[nooneknows]

Hi,
Please, does anybody have the Ibanes PH5 soundtank phaser schematics?
A friend of mine asked me if I could change the tone a bit, he doesn't like it.
If the circuit is similiar to other phaser I think I could replace some caps to match univibe taste.
thank you so much !

Marcello

PS ...there are a lot of 1458's inside... a bit noisy, isn't it?