I downloaded all three parts of the service manual given by mazamwarraich. I tinkered with the files, combined them all, removed some repetitions and wrong arrangements, shurnk the size and added bookmarks.
The file can be downloaded from here:
SF310 Service Manual.PDF
File size is around 120MB. I hope it will become more useful
BTW, I have already asked mazamwarraich about posting this file and he is ok with it.