Still Not good enough.
1. Your item 5 does not match with item 4.
Item 5 must exactly response to item.
2. You did not mention the Voltage level at the
Damaged coil.
Also you did not mention PD as the possible cause.
3. You would like to add brazing ring as one of your solution but you did not mention Vibration as
one of the cause.
Wirote W.