where is the hydraulic vent on an l2900 located? (for some reason, google doesn't help with this...)...i looked under the seat, as i saw a youtube where some fella had one under his, but no vent there...also, any opinions/experience with Bars Leaks hydraulic seal fixer? (yes, i do remember PT Barnum...)...I used the new Kubota synthetic hydraulic fluid in my recent change of fluid (it sure ain't cheap), and that stuff is managing to get out of my 30-yr old seals, here and there, just a bit...any/all input is welcome, as, for the most part, i ain't got much clue...