It really depends on what the damage is, I can't say I'm too experienced in this, but if it's just the solder joints cracked, I don't see why resoldering them wouldn't fix the issue for a while; or rather until they crack again. But if it's a motherboard damage, or CPU/GPU damage, then nothing's gonna fix it permanently. I know my friend PS3 yellow lighted on him, he got it repaired at a game center and he plays it heavily and it's running strong. You can even take it one step further and completely replace the solder with a lead based solder, redo your thermal paste with that arctic silver, change the power supply to a 40 gig PS3 power supply, replace the fan with the 19 blade (17 blade?) from a launch jap PS3, I'm sure that'll turn your PS3 into a tank.
