I have another Keithley 2000 with a broken TF-245 resistor array (pin 4-14 30k). I wrote Tektronix Support, but I want to have a plan B. In my case only one path is broken, so im considering putting another low tempco resistor on top. Any recommendations? I was looking at WELWYN - PCF0805 5ppm surface mount or two NOS Alpha Electronics (20k+10k 5ppm) in series. Those seem to be readily available at 20 Euro for both options.