My eXmark Lazer Z developed a pulsating sound coming from the right side of the hydro system. There was no change in performance. I couldn't pinpoint the sound as coming from the pump or wheel motor and not knowing a whole lot about the system dropped it off at the local eXmark dealer this morning. The dealer said they would flow test the hydro system and let me know what was wrong. So I rented one of their demo mowers for the day. I get a call around 4:00 and the guy tells me my mower is ready and they couldn't find anything wrong with it. I go into pick up mower and drop off the rental. They tell me that the hydro system had "phenomenal" flow at 9 gpm on each side and the mechanic didn't hear any noise from they system. The owner of the dealership is their talking with me and asks his guy if there were any metal shavings or fillings in the reservoir his guy says no clean as could be. I paid for 1.5 hrs labor 1 bottle of hydro fluid (they said it was low, I know for a fact it wasn't as I had just checked it before I dropped it off), misc shop supplies and the rental of the demo mower. They loaded the mower on my trailer and I left. When I went to take the mower off my trailer I could still hear the pulsating noise coming from the hydro system. So I looked in the reservoir and the hydro fluid looked "shiny". I grabbed a magnet and got quiet a bit of metal out of the reservoir, see photo. I am a little PO'd that I dropped my machine off for them to diagnose my problem and feel they didn't really do anything. I tried calling them of course its after hours. How should I proceed? I'm guessing I shouldn't run the mower with theses shavings in the reservoir?