LUD on 8/27/08, Pjiang, Xiaobaitu thank you

My spouse and child got RFE (I485)in LUD on 8/27, I tried to call USCIS, they said I797 letter will send within 15 days, I already delay her flight for the RFE, It looks like I might take another delay if I cannot receive letter next week. anyone know what is most possible RFE content for my spouse. TB, AOS stay in USA, WORK? thank you anyone can advise me where I can find possible RFE cases.
I guese if TB problem I can do it ahead before letter coming, Or How should I withdraw my spouse applications if something happens i cannot handle.

Great Appreaciate !!!!!!!!!!!