IBM X3950 X5 Problem Determination And Service Manual page 76

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IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Problem Determination and Service Guide
The following illustration shows the LEDs on the microprocessor board.
Microprocessor 1 Microprocessor 2
error LED error LED
Memory card
connector 7
Note:
a. You must remove the memory card or memory card filler from memory
card connector 7 before you can see the microprocessor board error LED.
b. You must remove the top cover bracket before you can see the
microprocessor error LEDs 1-4.
Microprocessor 3 Microprocessor 4
error LED error LED
Microprocessor System management
heartbeat LED
board error LED