My B2710's glow plug light came on while working in the woods and after I got out and turned the machine off the glow plug light stayed on despite the engine switch being turned off. Somewhat alarming...The battery was significantly drained as well so I say the indicator light was working. The service manual and parts manuals just arrived and I'm going through them any suggestions. I'm guessing a new relay or controller but would like to narrow that down a bit. Any suggestions?