Attenuator L-Pad switch to simple resistor problem

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Hi all,

I have decided to improve my old speaker quality by changing 40 dB 8 Ohm L-pad attenuator. Now the problem is what nominal resistor(s) and how to connect? Weird thing is that measuring resistance between 1-3 constant 0.2 Ohm, between 1-2 or 2-3 changes 0 to 3.4 and then to 0 Ohm again.

I am confused, any thoughts?

Thanks
 
Please find attached picture
 

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