With an experiment I figured out what it means. Double blinks mean that CPU B misbehave, single blinks mean that CPU A misbehave. Most likely I’ve damaged my CPU B while working on thermals.
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By the way, 2.5 gHz 630-7419 CPU card seems to be interchangeable with 2.3 gHz 630-7418 - I replaced broken 630-7419 with 630-7418 and it worked without an issue.
With an experiment I figured out what it means. Double blinks mean that CPU B misbehave, single blinks mean that CPU A misbehave. Most likely I’ve damaged my CPU B while working on thermals.