HOW TO find the resistor value of an unidentified SYTM

Hello, I am looking for a spare SYTM HP 5086-7441 unit , I suspect mine is dead on the plug-in .The pin switch inside is OK but the YTM does not function ,there are more than 30 dB Loss on the 2 to 20 GHz range during my search, I have found a spare on EBAYSIDE but the seller do not answer to my questions, when I ask to have the resistors values of the YTM offered , he does not answer,I suspect that he does not have any value anymore ,If someone have such spare unit with the value of the resistor ,I am interested,Again If someone have informations how to measure or obtain the right values of an non documented SYTM resitors values? For record the values for the dedicated SYTM are on a sticker along the side of the plug-in. if you do not have the rigth value for the the right SYTM ,the current value and the resistor associated with the old SYTM do not match and the filter do not follow exactly the harmonic frequency required.!
If someone can help me ,I will be very pleased to hear the way to follow.

thanks again for this great group
ON1EV
Belgium