I hate to upgrade anything any more because it is a 50/50 shot if it goes well. I finaly upgraded my 2.9.40 core router to 3.7 on our x86 system. Well it didnt go well. When it did the upgrade I lost the SBE T1 interface. What I mean is that it doesnt even show up in the Interface list, just the ethernet port. I down graded the system to 2.9.46 and the SBE showed back up.
So my question is, what happened? Is there a problem with 3.7 and the T1 cards?
make sure you still have the synchonous package loaded.