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About the closest you will find is a parts list I've linked to below. I'm not sure whether you are looking for a parts manual or an operator's manual. When Murray went bankrupt a number of years ago and was purchased by Briggs & Stratton, Briggs decided to offer only very limited support for the legacy products. If you have specific questions I may be able to answer them for you. Please let me know....
Type 0137 E1
Serial number on the body of the riding mower is S001678730413
The 465600X8A is a 2003.