Wastegate Solenoid and EGR Issue

Good evening guys, yet another issue has cropped up just the other night lol, so thought I would ask for some advice / ideas. EML came on with codes P0401, P0489 and P0243.

So from what I understand the EGR has insufficient flow detected, the control circuit A is low and the wastegate solenoid A is acting up. Previous to this, the breather hole on the top of the EGR valve has been seeping I presume black oil / some form of black liquid. I have read that this is normal but have also read that this is due to a perished diaphragm. Now, could the situation be such that the diaphragm really has perished and over time has leaked oil / sooty liquid which has potentially fouled the EGR electronics and clogged the wastegate solenoid? 

Any ideas would be appreciated. I'm thinking of doing an EGR delete anyways as I've heard you get some good benefits from it, rather than faff about replacing a diaphragm. Thanks!