I knew this problem. Had a different issue with an other PM G5 Dual with a defective 1000 W PowerSupply. I solved it by searching the www espacially in Germany where I live, for an company who repairs Power Supplies very cheap but with quality. Found one talked with them and disassamble the PowerSupply and send it to them 5 days after it was repaired and it cost under 180 EUR incl. 6 Month of warranty.
You must know that all powersupplies are nearly the same for an electrican. So go for it there are cheap ways to solve that problem.