Roland Spd-s pads not working

Check for a cracked PCB internally from the two defective pads, or if the wires have detached from the trigger. You may not need parts, but if you do, it really depends on how helpful the Roland distributor in your area is as to whether you will have any luck getting them, or you may have to go trough a local authorized repair shop.
Good luck.

It is very simple.. just open and check the cable from the mother board to the pads .. all the pads are connected with 2 film cables.. just check may be the solder has come out.. hope this will help