[TowerTalk] Help with Hygain TH11DX

[as1935 at 012.net.il]

Sirs,
I have a TH11DX which has been working well for over 12 years with very good
results.
Yesterday I lost 20m and 12 meters with very high swr....... almost infinity


On other bands I have 1.3:1 vswr with good performance.
I think it happened while tuning my amplifier using about 400w.
Wonder if their is a fix for the problem,its a real problem taking the
antenna down ,my tower is Rohn 25g sections at 45ft.
Thanks in advance.
Aron Slonim 4x1fq.