It would be well worth dropping Garmin service an e-mail on Monday morning and see if they would let you have the service sheet for this.
Garmin are quite good with help as long as you show them you know what you are at and are not going to turn around and bite their ass later saying they gave you bad advice.
Many marine manufacturers are also very willing to help 3rd party repair of older stuff if they no longer support it.
You may find there is no one in Garmin who knows anything about this pilot so ask them if they know of any longstanding Nautamatic repair agent who may be willing to let you have the service docs. The service manual would be a huge help to you into the future if you ever need to do further repairs to this unit. You are lucky it is a burnt transistor a burnt resistor would be far harder to identify the value.
Garmin are quite good with help as long as you show them you know what you are at and are not going to turn around and bite their ass later saying they gave you bad advice.
Many marine manufacturers are also very willing to help 3rd party repair of older stuff if they no longer support it.
You may find there is no one in Garmin who knows anything about this pilot so ask them if they know of any longstanding Nautamatic repair agent who may be willing to let you have the service docs. The service manual would be a huge help to you into the future if you ever need to do further repairs to this unit. You are lucky it is a burnt transistor a burnt resistor would be far harder to identify the value.