Will power cube failure cause over temp error?

Had several slots in Sensor3 racks reporting over temp errors right after system was powered up.  CPU temp was 72.  Noticed that first slot with error had a R20AF module in it.  Same in 2nd rack with problem.  Swapped out the questionable relays for units on the shelf and haven't seen any more errors.  Is this a known problem or is there something else I should be looking at?

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