–  SS. Systems Management - Service & Support.
–  TR. Time Reference - RTC, Master clock, drawer clocks, NTP.
–  UN. Unknown/any entity.
–  UP. LEPT Firmware Update.
–  UP. Systems Management - Updates.
–  WD. System management - Watchdog.
•  xxxx is an incrementing number of the Sub-System events set.
•  c identifies the severity, as follows. 
–  A. Reserved as Immediate Action.
–  B. Unknown / No action.
–  D. Reserved - Immediate Decision.
–  E. Reserved - Eventual Action.
–  F. Warning / No Action.
–  G. Warning / Deferred Action.
–  H. Minor / Deferred Action. 
–  I. Information / No Action.
–  J. Minor / Immediate Action.
–  K. Major / Deferred Action.
–  L. Major / Immediate Action. 
–  M. Critical / Immediate Action.
–  N. Fatal / Immediate Action.
–  W. Reserved - System Wait.
Chapter 1. Messages 3