don't claim about "bush" changed.just
tell them that lower level of fork oil and some works with the fork pistons are needed.if in doubt ,You can call some other dealer and verify the solution.In My Opinion ,You NEED to talk with TVS Engineer ;Perhaps He may not be aware of this solution.At least ,in Cochin/Nearby Dealers knows about this issue.So ,If TVS Engineer/Mechanic is available at dealer service ,Ask Him to do a Fork Overhaul(
no replacement needed ,I mean Beg/Pester the Mechanic in a Friendly R&D Mood to Open Up the Forks telling The Issue of low level of Fork Oil is the Culprit and it is Known to Dealers in KERALA/Cochin) as the issue is a less amount of fork fluid.Ask them to Call "Cochin Motors" Mechanic Head if in doubt or Mr.Pitchaiah of Banglore office(These are What I remember from My Experience).
Meanwhile ,it is
definitely worth having the fork fluid topped and having a fork overhaul.Ask them/Pester Them.But Don't Irritate them

Good Luck!