[targa911S]

given your excellent testing, I think the cleaning got it back on track. Shoot it some more I think it will be good for it. If it is working good, there is no need to repair the center support inside. To repair that requires complete take down. The repair is, no offense, probably beyond your skill and materials level. Side lock guns are very difficult to fit after repair. If it is shooting and acting well, leave well enough alone and finish the cosmetics. If you really want to remove the lock plates, remove the two short screws on either side, then unscrew the one screw on the side and tap it against the opposite sidelock to pop it out. Yes you need to cock the gun first or you will have to manually cock each lock before you can put it back in.