Salute!
Yeah, Wolfie, a safety grounding is not all that unique. The down time can be months or just a few days depending on the issue.
I participated in two as the jets matured and many more sorties were being flown by many more jets than during the test programs. Both of mine were due to the motors.
The A-7D had a sleeve on the fan shaft that could fail and there goes the TF-41. So we would taxi the suckers around to keep stuff lubricated and look for other squaks.
The F-16 also had a problem that did not show up for a coupla years and we did the same drill as we had for the SLUF. In fact, that's how I got my wife in the jet. We had plenty of family models being a training outfit, so we had all the wives take a spin down the runway before pulling the power back.
The oxygen thing is scary, as you may not know you have a problem when it is already too late.
Local station down here in PNS had a decent segment on the problem a coupla days ago.
Gums sends..