You have to visit Township Suzuki Motors Akbar Chowk. On the opposite side of Suzuki showroom there is Hyundai township show room near Akbar chowk.
Near that showroom you will see a street in that street there is a Suzuki shop on right side, name Kashif Suzuki he is company trained mechanic (according to PW member) Mechanic name is kashif cell # is 0300-4146959 (don't know its still working)
The mechanic deals in Suzuki bikes specially GS. You should give him a try may be he can fix your GD.
Do let us know about your experience with him. Good luck