Personally I would view it with some degree of urgency. Yes, I know you don’t see it showing up in the velocity spectrum, but it’s a slow speed machine and you DO see it in the acceleration time waveform (12g’s peak-to-peak). Also the presence of two different defect patterns (inner and outer) is a caution flag for me (bearing may be progressing to the point that damage from one race is propogating to the other). The noise you mentioned is another caution flag.
I assume you are getting inside the column onto the bearing housing to get your measurement. If you are measuring from the outside of the column, that suggests even higher severity.
> "The guide bearing was inspected during a stoppage and found to be in acceptable condition"
I would not put much faith in that. There is pretty limited ability to inspect the races and rolling elements on a deep groove bearing without cutting it apart. By the way, did they rotate the shaft during this inspection? If not, then you can call B.S., the inspection is almost meaningless - the portions of the race accessible for inspection are severely limited without rotating (and even with rotation very very difficult / limited).
Comment on the design: I see an upper (guide, 6306) and lower (thrust, 29322E) bearing in the reservoir with oil level maintained in middle of lower bearing. There is a slanted port in the "runner" (runner might also be called "collar" or "bearing carrier") whose apparent purpose is to "pump" oil to the area just above upper (guide) bearing. However, it's not obvious to me that the bottom of that slant tube will be able to capture any oil at all for pumping ,since the bottom of the slanted port is far above the reservoir oil level maintained by the oiler. I presume this area inside the runner will have similar oil level as the reservoir since the area between runner/standpipe is vented to atmosphere below via the shaft/standpipe clearance and presumably the oil reservoir is also vented (for that matter, you would have oil leaking through the shaft/standpipe clearance if oil got high enough to reach the bottom of the slant port) . In other words it doesn't look like this design will reliably lubricate the upper bearing. Am I missing something?