DECpc AXP150 and DEC2000 Model 300 AXP BIU Parity Errors

This Field Change Order (FCO) addresses BIU memory parity errors and machine check code 214 that may occur on DECpc AXP150 and DEC2000 Model 300 AXP servers under extreme system load. It specifies that this is not a routine maintenance action and should only be applied if specific symptom and motherboard revision criteria are met. The document includes a revision matrix for motherboards, safety precautions for handling electrostatic discharge-sensitive components (using a Velostat kit), and step-by-step procedures for replacing the motherboard, concluding with system self-test and LARS report submission instructions.