If its just servicing you can do it yourself too. You need to have a good vaccum cleanear / blower to blow all the dust inside. The you need to have CRC (contact cleaner) to lubricate all the controls (volume, balance etc.). If the RC jacks requires replacement then do it. Check if all connectors are tight and if they require replacement too. Note if any of the capacitors have leaked and if they require replacement. You will also need one brush (one used for wall panting - small one) to brush all the dust stuck to the components. Do all this and you are done. If you require help then PM me. I stay at Thane.
Thank You for reply. i am located in borivali east.The amp is quite heavy so would like to have serviced at nearby location.I did the basic cleaning but require some servicing.