TMM debug mode

I think you're most likely talking about logging level, which can be set on a per-process basis. The most common logging level switches are visible in the GUI under system / log / options, but tmm is not one of the ones that appears in there.

The easiest way to see which settings are non-default is to generate a qkview, and upload it to then in iHealth, open your qkview, click on Commands, type "non-default values", and click on "list /sys db all-properties (non-default values)".

In the resulting report, you can search for "log.level" and see if anything is set to a non-default value. You can change it back with "tmsh modify sys db xxxx value xxxx", for example "tmsh modify sys db log.tmm.level value notice"

In case you're talking about the debug version of tmm discussed in SOL11490, then it can be identified by the word 'debug' appearing in the startup message in /var/log/ltm, as noted in step 5 of that solution article.