Replace the toilet...
Replacing only the motor will cost you as much as a whole new toilet...'cuz you'd have to special order the motor--which is the most expensive part of the toilet--for full list price. And it's a LOT easier to drop in a new one than to try to disassemble and reassemble the "works." The Raritan SeaEra http://www.raritaneng.com/products/toilets/electric/sea_era.htmlis a far more durable toilet, and is designed to be an identical replacement/upgrade for the Jabsco 37010...and you can buy it as either a complete toilet or the "conversion," which is everything but the bowl, seat and lid. A bunch of people here have SeaEras and love 'em....these folks have the best price: http://www.boatfix.com/elec/rarprod.asp (the online store here doesn't carry it). If your toilet isn't already on its own dedicated circuit, put it on one when you reinstall. If it's not on its own separate circuit, anything else on the same circuit that's also on when you flush results in low voltage to the toilet...which can burn out the motor. Btw...All toilet mounting bolts are lag bolts...no nuts...just back 'em out. Afterthought...if there's a vented loop with an electric solenoid valve in the head intake line (which there should be if the head is below the waterline), it's just possible that it's only the solenoid valve that's shot, not the motor. See the "manual" for your toilet here: http://www.jabsco.com/prodInfo/overview/37010-0000_ds.pdfOtoh, if you can hear the motor humming--HUMMING faintly, not actually running--or feel any heat on the housing before the breaker blows, it's the motor.