Yes, the air suspension issue has been rectified, sorry for not updating.
Meanwhile, one of our drivers in kerela told me that the GC of our buses are very low. It will easily scratch/break its front bumper in hilly areas while negotiating sharp turns. So thereby that driver has advised us to increase the GC by adding additional plates to the front leaf spring suspension. he insists this is done on every bus in kerela. I asked some experts & found that its true.
we already had the leaves of the rear leaf spring suspension (which has been replaced by air suspension). three extra leaves have been added to the front suspension & this has increased the GC & the drivers are satisfied. this was done at a specialized 'leaves' workshop who has been doing this job for ages. however, one bus had a slight tilt to the left. so, in that bus, four leaves have been added to one side & three leaves have been added to the other side to compensate for the tilt.
frankly, i feel some of the procedures/requirements of these heavy vehicles quite strange, scary & sometimes amusing!
Also, there was a major difference in the odo reading between both the buses. the difference would be around 20 kms! since we knew the actual distance from allepey to certain locations, we knew that one of the bus had a faulty odo which was clocking more kms while the other one was working perfectly.
TVS replaced the odo of both the buses with new ones, free of cost. now it is working perfectly but now the odo reads 0 kms! our buses had run around 10000 kms before this!
By the way, we are getting an average of 4.15-4.25 kmpl on both the buses now, after the first service. a major improvement from 3.5-3.75 kmpl.