Belt Area Squeal - PAS Pump?

[Niall]

Always torque the crank pulley! Your oil pump is driven off the crank and the pulley for it is only kept in place by a tiny woodruff key. Considering you can be making 80psi plus at some points, that woodruff key won't hold it so the pulley is held by friction from the cambelt pulley which in turn is held by the crankshaft pulley.

Have a good look at all the pulleys. Could be that one has failed and is wobbling or isn't sitting right.