Lenovo THINKSERVER 3797 - Manual (Page 51)

12v channel error LEDs indicate an overcurrent condition. Table 4 on page 143
identifies the components associated with each power channel, and the order in
which to troubleshoot the components.
The following illustration shows the LEDs on the riser card.
PCI Slot 1 error LED
PCI Slot 2 error LED
Chapter 5. Diagnostics 43