This is what I know about recourse, please correct me if I am wrong.
If you OOC during your BMT due to medical grounds and you have since recovered and your PES reinstated.
You have to do recourse, since you never actually POP from BMT.
The recourse will be based on your PES status, so if you are PES A/B. The period of recourse is equal to your eariler BMT course, unless you have been downgraded.
Here is the difference, some BMTC company line will based on your earlier BMT and see which items you need to do. Example, if you have completed your IFC in your earlier BMT, some company line will excuse you from it, which means you stay in bunk and "twang".

But there are also some company line will expect you to go through all the course, so it depends on the company you are doing your recourse.
But if you suay suay kena recourse with enlist recruits, most likely, you have to do everything from scratch