RE-002 are good tyres, if still grip well might as well keep for a while longer.
Tyre leak nothing to do with alignment....lol
First check for puncture. A nail or screw embedded in the tyre will have slow leak. If there are no puncture, next you need to check the area where the tyre fits the rim. Lay it flat on the ground apply soapy water around the tyre where it fits to the rim. Do for both sides. If still no leak then check the valve area, also the dust cap, see if anything inside. If all fails to have any leak, last resort submerge whole wheel in water. If still no leak, then I also cannot help you.....hhahhahahha