Sorry forgot you were on an eci, for some reason I was thinking Huawei this morning.
You're correct that power to the dslam shouldn't affect the profiles as those should be held elsewhere and sent to the dslam. The element managers in the exchange stores ongoing data about your line and the dlm system itself via the oss determines the profile. This then should send it to the dslam.
Pure speculation here but wondering.. With you being away, your ILQ status would definitely be black. I wonder how long history is stored surely it should be more than two weeks somewhere even if there was also an issue with the element manager losing data. I really don't know why yours should have been interleaved.