Signal on 101 (A) satellite only

About a year ago the wind blew my dish out of alignment. I was able to realign it to satellite 101 and everything was just fine. I didn't have any HD in the house. I finally just got HD now and it tells me that it cannot receive signal on satellite B or C. I have been up there fine tuning this thing and have all 95s or higher on satellite A. Is it possible that it is still out of alignment for satellites B and C even though my signal is so strong for satellite A? I'm not sure what else to do. I read one post stating that maybe the two LNBs are bad. If I'm going to buy new LNBs I may as well buy a whole new dish. Is there any reason to upgrade to the slimline 5 LNB dish or is the 3 just as good? Is there any way I can test the LNBs before I buy a new dish. Any input you have would be appreciated. I hate to spend the money on the service calls.