bolt torque
Usually when you see this restriction it means the bolts are installed in a 'torque to yield' manner. This means the bolts are torqued and then usually measured. They are then turned in some additional amount either by measuring the bolt or just by twisting it in some additional amount of rotation. This stretches the fastener to it's yield point. This provides the maximum available holding power, but means the fastener should not be re-used.
Bottom line: It is a lot of work to get to them. Personally, I would replace them.
JMHO