White lines & inverted picture at top of CRT...

Question

A 10 year old CRT screen has started showing 5 or 6 horizontal white lines in the top 20% of the screen, plus this portion of the screen has an inverted "ghost" image. It isn't consistently there and seems to vary from day to day and from channel to channel - sometimes it is not visible at all on one channel, while being quite pronounced on all the others