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I think the concern was that the rack might be bowed, because the metering pumps were popping out of the rack at shutdown. Could just be poor install too.
If you had power at the 120v outlet, the extended cranking shouldn't have done anything... The field was excited and the genhead was making power the whole time. Perhaps you got lucky and some corroded item found a path through it, but I don't think your problem is 'gone'.
I had 3 of them 6 months ago that had been sitting here for a few years, went to a local Vietnam vet scrapper with some seized blocks, skid bases etc earlier this spring :(
Have you downloaded the books on this machine? https://www.steelsoldiers.com/threads/mep-1030-1031-ammps-5kw-6115-01-561-7329.158371/
In the -10 book they have troubleshooting info related to ' Engine fails to crank '. I would start there.
Yes your N and GND should be bonded together in your panel, so you will want to disconnect the bonding bar in the genset. And reinstall if you are using as a discrete power source somewhere 'in the wild'.
N and GND should only be bonded once... so just think of it that way.