+1 on pulling the pumps rear cover , cleaning it up inside and putting a new gasket on! its a really stupid design that it held on by 2 bolts then uses the clamping force of your other bolts also. If it didnt leak from there before and u do everything right but that cover it will DEFINATLY leak on you lol

Ultra blue FTW

If your above stated 4 bolts look crappy in the least just replace them It will save u more then one head ache and swearing rant later.