Field Change Order for DEC 4000 Model 610

This document outlines FCO KN430-0005 for the DEC 4000 Model 610. The FCO addresses system crashes caused by mailbox timeouts, parity errors, and 'NOACK' problems associated with earlier revisions of the B2101-AA FRU. The solution requires installing part revision H1 or H2. The document provides detailed step-by-step instructions for the field replacement, including system shutdown, anti-static safety procedures, firmware/address verification, and system testing. It also includes charging information and the necessary LARS reporting codes.