Walker Mower MTGHS 26 Service Engine Light

[pa_pc_man]

I get an intermittant yellow light on my Walker MTGHS 26HP with 360 hours on it. Oil was changed 60 hours ago. Lub about 20 hours ago. Mower is a 2003 model. Changed battery today. Other than that the mower appears to be working great. Gave it a thorough cleaning today to make sure there were no shorts. appears to have a tiny hourglass or H in front of the Hour meter.

Am I missing something minor or must I call the experts?

Thanks

Bill