Roger:
Should you ever get those two plugs out be sure to torque them to the correct spec. when putting them back in. Most gear heads I know can't tighten stuff enough or use thick enough
oil. If the plugs are 14mm torque them to 180 LP-INCHES (15 pound-feet) using a torque wrench (no more). Be sure to use an anti sieze designed for plugs. I bought a torque wrench just for this task.
Do not overtighten them!
Bob