yeppo,
I had a similar experience and am still searching for an answer. My 140 was approved in 2002 and then suddenly the LUD changed after 6 months or so.. I tried calling customer service, talking with my ex lawyer (have changed jobs since), even filed FOIA for 485, but could not find anything.
Only 2 things come to my mind (A) I had filed 140 as CP but later changed to AOS. May be they updated the 140 with the AOS information and that caused LUD change. (B) I had gone for FP one month before the LUD changed on 140, so may be that caused it, though it doesn't makes sense that a 485 FP will cause 140 LUD to change.
Did you start your 140 as CP as well?
Are you still with your sponsoring employer? If so, you may be able to ask your lawyer to find out thru AILA. 140 is the fundamental base of 485 application, so I can understand why you are getting so worried to find out.
Please keep me posted as well.
- ab