In another post it was stated that all 5800 series has updated parts. I question the source of that statement, as I've never seen anything from Uniden that confirms that. If that is true, and the first digit is the YOM, that means they had parts for the production line almost a year ago, but only started fixing units a few months ago. Those two "facts" seem to conflict.
It would also mean that no units with SN in the 5800 range will have the RTC or backlight issues, and I'm not sure that is the case either.