Servo no behaviour modules

Edited for more accuracy, especially if other players encounter this issue and read this as well.  Edits are in bold.
88465bc6f5843ea7​ Hello!  Are you still having trouble with not seeing the behavior modules?  If so, please check your servo's enhancement progress and post the percentage here.  More importantly, do you know what level your servo is?  There are 10 levels and each one brings a new upgrade. The percentage that pops up after checking the progress indicates the progress toward the next level. 

I checked in my game and saw what you described.  I wasn't sure what to do at that point, so I researched it and found the servo must have a certain level of enhancement progress before the modules are available to unlock.  I did not find the percentage needed for it though.   After further research, I found that the first module becomes available at Enhancement Level 2.  More modules are added at levels 3, 4, 6, 8, and 10.  The level is increased by having the servo learn skills. 

I'm still testing to see how long it takes and at what level the modules show up.  I'll come back to report more findings.

Edit to add findings from in-game testing:
When I had my servo gain skill and reach 100%, there was an option to Self Enhance.  Choosing this option made the servo go into a kind of sleep mode and eventually I got a notification he had achieved Level 1 and gained the ability to Download Enhancement Data.  The download was taking a really long time (the progress bar barely moved after 24 in-game hours) so I did more research. I learned that increasing relationships and skills is faster and more effective than downloading data.  
It took about 6 in-game hours of improving relationships and getting the servo to Skill Level 2 in a couple skills to reach the next 100% progress.  By the way, my human sim was able to mentor the servo in those skills which made it go much faster.  The timing for the Self Enhance was around 2 in-game hours.  Then, voila, Enhancement Level 2 was reached and I had unlocked 4 behavior modules.

As far as I can tell, there is no way to track the Enhancement Level in the game until one of these notifications pops up.  This should most certainly be displayed somewhere; some kind of tracker like we have for skills or skill trees for other life states.