Here is some more cstm stuff. Tested on an old 10.20 of our own...

from the cstm prompt, run logtool...
runu logtool

You should be at a logtool prompt.
sl
This will switch to a new log, as a side effect, you learn the name of the old log. "log2.raw.cur will be renamed to log2.raw" or something like that. So enter log2.raw when asked after you run:
sr
this will give you a summary of the errors in the log file you select. Then it prompts you with a misleading prompt. All this command can do is redisplay the summary...get out of this command and format the log file:
fr
You will pick the directory, it will pick the name. (It will remember that name for the next command.) Another summary and another chance to reprint the summary...get out. Now display the formatted log with fl:
fl
finally you see the errors.