MP 1,1-5,1 Mac Pro 2012 5.1 red lights on CPU board

[culser]

2 red lights on the cpu board have come on, i don't remember when.
what do they mean

Mac Pro 2012 5.1 2 - 6 core 3.46Ghz / bootRom 144
installing Monterey as the time and date of this post

Please advise

 

[tsialex]

The CPU tray have one red LED per DIMM, when the LED is lit is a signal of a problem with the DIMM. See page 23 of the Apple Technician Manual.

PDF: Apple Mac Pro Mid 2010 Mid 2012 Technician Guide Service Manual

Mac Pro (Mid 2010/Mid 2012) published: 2012-06-11 resolved (1 new document): =============================== Apple Mac Pro Mid 2010 Mid 2012 Technician Guide Service Manual [pdf. 2012/06/11] =============================== Is this service manual available? I see it only referenced here and of...

forums.macrumors.com

 

[culser]

a photo of 2 red lights
looks like DIM 1, and 6. ...