Hello Rick,
you'll find the error codes within the help system. Open function autopilot, then select the function ISERR and press function key 1. Within the following help page there's a link with the descriptions of the error codes.
eg.
516 Internal syntax error Matrix is expected on the calculation stack, but is not available.
527
Internal overflow
Interpreter: References, such as when a cell references a cell, are too encapsulated.
Kind regards, Joost
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