IBM 8853L6U Service Manual page 110

The following illustration shows the locations of the system-board error LEDs and
the system-board light path diagnostics panel.
The following illustration shows LEDs on the system-board light path diagnostics
panel.
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BladeCenter HS21 Types 1885 and 8853: Problem Determination and Service Guide
c. Remove the cover from the blade server.
d. Press and hold the light path diagnostics switch to light the LEDs of the
failing components in the blade server. The LEDs will remain lit for as long
as you press the switch, to a maximum of 25 seconds.
NMI
NMI error LED
MIS
Microprocessor mismatch error LED
SBRD
System-board error LED
TEMP
Over temperature error LED
LP 1
Light path diagnostics LED
Light path diagnostics switch
DIMM 4 error LED
DIMM 3 error LED
DIMM 2 error LED
DIMM 1 error LED
Microprocessor 1 error LED
Microprocessor 2 error LED
Light path diagnostics panel
Power jumper error LED, if equipped
Battery error LED
SAS 0 hard disk drive error LED
SAS 1 hard disk drive error LED