There is no issue going into the lower amber band, however the basic 25° bank + 15° overshoot is not completely assured so you have to limit your bank angle.
Depending on the type of Boeing you will get different requirements, but on the classic non-fly-by-wires I believe you have to go into HDG SEL and limit the maximum bank angle. Halfway down the amber band, you should set 10° which gives you max 25° (10° with 15° overshoot taken into account).
It is fairly uncommon to get into the amber band during descent, it does happen in cruise if ATC needs you higher than optimal and starts playing with speed restrictions.
Last edited by BraceBrace; 18th Dec 2021 at 19:43.