Please go to C&W office at NDLS
U will find answer 😪
SM can be done at pf as well

Specially at big stations
There...
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is particular offices at major pf on big stations..
.
In above case 2nd reason is that
For revised coaching depots rule
For.long distance journey train round trip 3500 km
Has no mandatory under gear examination and brake system maintainance..
As TG round trip is around 3300 kms approx
And GT round trip is more than 3500kms
Hence GT round trip is above 3500 kms
And it took time for SM
Read 3rd one..
And for LHB rakes after 2015 i guess not sure with year.
PM can be done at platforms as well if staff is skilled and trained
There are many trains which are example of that

Ndls has 16 pf..
Its crowded for pax..
And when they find fault that is least possible now a days specially in LHB due to warranty on every single items used in making coach
My one of big bro is in JHS coach factory
He...
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said LHB is not only for safety and people safety choice etc
Buts its resolve railways problem as well
PM, SM is easy for these trains as compare to ICF
As ICF are very old, not best quality material used..
In LHB companies which provides parts for assembling has now mandatory guarantee/warranty for fix year of time hence fault is least and if there is they simply try to fix or remove the coach..
I remember KV never went from NDLS pf, hardly they parked it on adjacent non pf line after checking
Once they took the half rake in coaching depot and replaces 1 3rd ac coach (SR mark)
And join it again..