I've experienced a problem with Arkemyr manor.
NB: I had actually completed this quest before, prior to patch, so I know all the steps to do it stealthy.
I entered the manor successfully from the bathhouse, passing the skill checks and not raising the alarm; got the combination , but realised I didn't have enough mechanics skills to disarm the entrance to the vault. So I left (without being noticed by guards).
But now, when I try to enter the manor again, an instant alarm is being raised (even though I'm not seen and the path from bathhouse had already been cleared)
Same happens when I try to enter the manor from rooftop - instant alarm.
The savefiles are here (before entering the manor from the bathhouse and rooftops - and after entering and instant alarm):
Hope someone can assist. Don't want to kill Yellow Eye-Three for the stone