[TowerTalk] ANTENNA ROTATOR STOPS AT PLUS AND MINUS 45 DEGREES, ANY IDEAS?

[W3CP]

When getting on for the SS SSB today, I found the antenna would rotate from 
north to exactly NE or NW and no further.  The rotator is a Yaesu G-450A 
that was first installed October 2007 in a crankup tower at about 50 ft.  By 
eye from ground level it appeared that the coax and control cable were not 
fouled.  Seems like there should be a clue as to the trouble provided by the 
exact stoppage at plus and minus 45 degrees from north, but I dont know what 
it is.  Prior performance has been OK except a time or two I noticed the 
rotation slowing down as it went past NE, but at the time I though it was 
just the wind load, it can be very windy here. I may not be able to get the 
tower down for some time, and any thoughts would be appreciated.

73,  Jim  w3cp