I had one AppleScript Action Group listed in the Event Log.
I deleted it as I no longer needed it and then ran the help menu command again.
I got this error:
Error internal error calculating showDeprecatedUsage
Error UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 30: ordinal not in range(128)
I guess this may be related to the previous bug I reported?