We need to replace the two drive belts on our Yard Machine driving lawn mower, Model Series 660 through 679 purchased in 2003. Can't figure out what we have to take off the machine to get the belts off. One is a serpentine belt. The other is a standard belt. Also wondering if there are any repair schematics or troubleshooting guides available for this machine.

Need a diagram that would help me change the belt on a Yard Machine Tractor lawn mower 742 RL