Replacement hardware?
I would think, if those RM03s and RM05s were getting all that finicky, that they'd be phased out for newer equivalents. I can't find the info now, but I'm fairly sure by then vendors sold equipment for PDPs and the like that let them replace these drives with regular SCSI hard disks (possibly even IDE, although I rather doubt it.) Although I've certainly seen shops like that, if it works don't touch a thing other than the required upkeep.