In the air you cannot tell how serious the problem is, the ground is the place to be, if it can be achieved in safety.
Just to cheer everyone up, a number of moons ago,
I was invited to examine the internals of a Hughes 500 main gearbox that I had been flying.
Sitting on the main ring gear was a pile of swarf
which was the remains of the main input bearing.
The bearing had virtually no chrome on it and appeared to have been chewed by rats. Failure time dead soon.
No chip warnings had occurred. The engineer had noticed the metal in suspension in the oil sight glass. His comment was that if we had been using one of the darker Mobil oils and and not Shell 500 it would not have been seen.
Sometimes you just get lucky.