If it gets hot, active cooling might help. Saved a couple of customer disks by putting them into a fridge (in a sealed bag, of course).
Depending on the arrangement of data, the heads might be fine, or one head is damaged. It's a good idea to figure out, which blocks can be read and which can't. There might be a pattern there.
However there might be physically damaged areas (scratched by a headcrash or particles leading to a crash), if this is the case, further damage might occur, even to other platters (lumps of particles might fly around the housing).