We had minimal PI issues through the night; most PI related locklosses over the past week could've been prevented with simple early-action small phase changes and tonight reinforced that. Jim and Nutsinee were both successful at damping; I fixed Jim's earlier problematic MODE17 with a filter change and the rest of the 4.5 hour lock went smoothly, requiring only one phase tweak a few hours in.  We lost lock from the power glitch.