Hardware Owner's Manual (PDF)
Page 22
... The code on the LCD can display sequentially on the status LCD, locate the code in Table 1-4 and perform the suggested corrective action. Check the SEL for details on page 110. W1228 ROMB Batt < 24hr Warns predictively that a microprocessor is not installed in the See "Troubleshooting System FBD memory subsystem ... and is full of the connections in this table, see the "Glossary" on the Northbound side has failed. See "Troubleshooting System Memory" on page 92. I1912 SEL Full System Event Log is unable to determine the problem if multiple related errors occur.
... The code on the LCD can display sequentially on the status LCD, locate the code in Table 1-4 and perform the suggested corrective action. Check the SEL for details on page 110. W1228 ROMB Batt < 24hr Warns predictively that a microprocessor is not installed in the See "Troubleshooting System FBD memory subsystem ... and is full of the connections in this table, see the "Glossary" on the Northbound side has failed. See "Troubleshooting System Memory" on page 92. I1912 SEL Full System Event Log is unable to determine the problem if multiple related errors occur.