The phrasing “Airframe vibration with unusual engine indications” is common between the CF6 and CFM56. The only dramatic jet engine failure I’ve experienced wasn’t a GE engine but a Pratt JT8D and it only had a “Engine Fire/Failure” checklist. The was a little shudder and then a couple minutes later the four and a half bearing failed with a WHOLE lot of shaking. After 5 or 10 seconds when our eyes could focus on the engine gauges there was no rotation in one section, maybe both, I can’t recall. I don’t think you could have an engine seizure without some unusual vibration.