updated the CTT script to test all of the bad codes (only those listed that make sense) - updated test case as needed to - better explain what is expected and what is being tested.
for err-2
Add:
bad_IndexRangeInvalid
Bad_SecurityModeInsufficent
Remove encoding related ones - since they only apply if reading a structure

for err 3
updated text to indicate that the value is replaced (no value) and just return the appropriate status code - status code list should be updated to set the appropriate bit (maybe further explanation - Bad - is none-specific bad, other that are listed are good enough - the expected result should indicate that the bad value is handled