My light comes on after about 20 minutes of driving. The fluid level is about an inch above the max mark so I know it's not really low.
I figured the sensor was dirty so I removed the reservoir and flushed it out as good as I could with a garden hose and nozzle. It didn't help so whenever I get tired of looking at that light I'll see how much a new bottle is from Steve at Signature L/M vs the local dealer.
Save yourself the labor cost and replace it yourself. It's not that difficult to remove.
