GXGX! which center? What is the PD on your approved EB2 I140?
I have similar situation as yours.
EB3 I140 with PD Jan 2003
EB2 I140 with PD Jan 2006
I485 was filed using PD retension rule on June 2006 when neither EB3 nor EB2 was current.
NC was cleared.