R&S FSP-30 step attenuator repair

I purchased an R&S FSP-30 on Ebay which had a defective system disk. After replacing the disk and rebuilding the system firmware, I saw that the step attenuator is also defective. After determining that all 3 attenuator pads were burned out (measuring ca.400k, 8.2M and 530k for the 10, 20 and 40 dB pads respectively) I decided to take the step attenuator apart and attempt repairing it. The pads are soldered into removable brass fixtures. I am trying to source the individual pads to be able to attempt replacing them. The fixtures measure ca 10.7mm x 5.1mm x 4.9mm and the pads measure ca. 5mm x 2.5mm. Has anyone already attempted repair of this step attenuator and/or have any references for sourcing either the pads alone or fixtures with pre-mounted pads?

Thanks for any help.