hi Rugo,
this link below should get you a PDF scan of the original (and nearly complete) step by step trouble shooting guide for 986067 radio.

https://drive.google.com/open?id=1YeoUqpSJd44AO1oJG9sOvFT-Nj9jAp_f

i do not have the following page for this guide, i found this document online a while ago and do not recall who was hosting it
best of luck
-s