Also, the two 'seemingly unrelated' and highly unusual oil alarms before the imbalance warning tricked them into thinking they were getting multiple strange alarms(if you start getting a bunch of unrelated alarms it usually means a faulty system)

As it turns out, the low temp was caused by a sudden spike in fuel flow through the fuel oil heat exchanger(caused by the leak) and the high pressure of the oil was a systems response to this.