Theres some in-depth breakdowns for the PO 12,14,16 here(http://hackingthepo.weebly.com/) if you're interested!
I have no idea about the po33 and if the juice is worth the squeeze, but they're cheap enough to tear apart so go for it.
Very neat, thanks - probably this is just enough beyond my abilities that it'd probably be me bricking my PO rather than accomplishing anything useful :-)