Norm,
That is something I have notice over the years that problems tend to come in groups as if they are manufacturing defects. Ten years not a single hydrostatic cooling fan problem and then 3 in a row this month. At least it not like the 50+ desktop calculators that I had to replace the CPU chips on due to an adding problem back in the early '80's.
So it is not hard to believe you had 3 new plugs to fail in short order.
