The California ISO has revised the operating procedure referenced below.

2330C Exceptional Dispatch Instruction Type Codes, version 6.0, effective Nov. 26, 2019

Added Background section.

Restructured Exceptional Dispatch (ED) Instruction Type and associated Reason/Other Reason matrix.  

Added CAISO Tariff and procedure references.

Minor format and grammar updates.

ISO Operating Procedures - http://www.caiso.com/rules/Pages/OperatingProcedures/Default.aspx