This does have to do with a PSU "firmware".  I do not know how to repair this although the PSU by Murata is no longer the same.  I am not sure of the difference but the pn has been changed.  Since there are no more updates if you go to "murata.com and do a search you will find the newest PSU and obtaining one might help.  I think I am OCD but I would replace both at the same time since there are 2.  Good luck and I hope that something works better.