Then first you should make satisfactory repayment arrangements with the holder of the defaulted loan, if you don't do that first then you wouldn't be eligible.
And what do I have to do if the loans are with different loan servicers?
just submit a separate form to each of the servicers.
In my case, I taught at school that was included in the TCLI Directory only during my first year of teaching. Would the rest of my teaching years be counted towards the 5 years to qualify for the teacher loan forgiveness?