Repair digimod1000

Hi guys I need your help on this Digipro1000 power supply, I fixed the switching circuit by changing the 2 mosfet and the Pwm but I have a problem: on the secondary I should have +70v and -70v instead I only have +30v and -30v what could it depend on? I'm attaching the diagram, I've already tried to change the capacitor from 1nf but nothing changes. What do you recommend?