Sure thing, XeD.
From the very little details you have stated so far I can only guesstimate however. And my opinion can only be based on my understanding of what you write. A more detailed description of what you exactly see, what measurements you have done and how you ruled out the other boards would be very helpful.
Apart from the obvious voltage measurements, Y1 and C52, which you probably already verified, I can suggest checking U2, U3, U4, U6, U10, U12, U23 and U26. Do you have an oscilloscope or just a DMM?
EDIT: I forgot to mention that U26 would be my suspect #1 as it is common to both defects you mentioned.