I have a Trane heat-pump [AC/Heat unit] that is about 12 years old. It has run flawlessly for this whole time. Today I noticed the digital thermostat was out [it was set to heat]. I checked the unit breaker [60 amp] and it was tripped. I reset it and it almost immediately tripped again. I'm a handyman but not a professional electrician by any means. Should I just call a Trane repairman?

Yes