Repaired MANY of these things. For whatever reason, Motorola soldered the plugs to the PCB, which makes it difficult to remove. Once you get all of the solder off and the PCB out, it's pretty straight forward. Don't order the parts from Motorola as you'll spend way more than just getting the parts from Mouser or Digikey.
Typically, the only parts that fail are VR1, U1, Q1 and Q2. I have replaced the capacitors in a few that were bulging. If I can remember, I can get you the Mouser part numbers. I think you can get all of the parts for about $7 from Mouser, vs Motorola wanting about $25.