[TowerTalk] A3 problem

[N2TK]

Looking for suggestions with a Cushcraft A3 problem. Up till this year it
worked well. The swr was minimum at 14.1, 21.2, 28.4. Now it resonates at
14.5, 21.2, 28.0.

Compared to a C3E on another tower at the same height, 35', 15 and 20M are
comparable. On 10M, signals are down from 4-6 s-units on the A3 compared to
the C3! The element dimensions have not changed. I would guess it would have
to be a 10M trap. What else could it be? But which trap(s)? Puzzled that 15M
resonance didn't change.

Was thinking of using a dip meter to check the traps. 

Any ideas or have you seen a similar problem?

Tnx

N2TK/NP2, Tony