I gather you have an IQ and its connected to the telephone line but that shouldnt have any effect on your Satellite reception what so ever.
If those trees are between your dish and the satellite, that could definitely be a problem even though they have 'Been there for years' because trees GROW and the foliage could be denser than it was before and when moisture collects on the limbs and leaves, you could loose the signal, the same as during heavy rain and snow does.
This was always a problem in rural locations years ago for analog TV when in fringe areas.
There are several alternatives, lop the top out of the trees , raise or relocate the dish to a more open 'aspect' if possible.
A rough way to see what the dish 'see's' is to get a piece of plastic pipe 50 to 75 mm in diameter, incline it between 45 and 60 degrees facing the north and look through it and if you see 'Tree's' and not blue sky, then you have a problem.
Did the 'technician' use a FSM to test the signal because I feel that would have shown the signal fluctuations and if the LNB is ok, something (Trees) must be blocking the signals path.
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I had a thought after posting this that the cover on the LNB is in good condition and not damaged or missing because if so maybe on of Natures little critters has made its home inside the feedhorn as its happened before.
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