Recently purchased a 2004 L3130 HST. Changed all fluids and Filters, fixed several leaks. The current issue with the tractor is operation (just driving, no implements) in Mid Gear the tractor very easily BOGS down as soon as there is the slightest incline in travel, and in High gear immediately BOGS down and will not move. The tractor seems to function perfectly in LOW gear which is really all I need, however it would be nice to have the other gears when moving around the property. Any thoughts before I take to the shop?