I have measured the voltage of each of the 3 cells.
4.2
3.6
2.6
I am in the process of charging each individually while they are still in the pack. When they are all charged up, I will do a run test and see what happens. Maybe an imbalance occurred because of the charging circuit. But I think what actually happened is that those 2 cells failed. We shall see.
I have 20 IMR’s available from this thread.
I will probably just replace the China cells with 3 of those.