I had lines like that on my QHY12 and I had to send it back to China for repair and they replaced the main board (corrosion on the tracks).
Cost was pretty reasonable, $65 each way for airfreight and $85 inc labour for a new main board. Turn around time was 3 weeks.
You will have to start a service ticket and they will email you the return procedure.
http://starsensesci.com/helpticket/
Cheers
Bill