the KK105S have no parts which need cleaning, apart from the head grille, and perhaps sometime the capsule.
The pcb is of course not available separately, as it is soldered together with the pins, glued in place, and specially lacquered.
With pcb # 84950, this seems to be an older KK105. Please confirm that the KK105 could be opened by simply taking head grille and inner assembly apart, and that it does NOT have 3 tiny hexagonal screws at the bottom, fixing everything in place.
In any case, you will need a complete new inner assembly. For the 3 hex screw KK105, the spare part no . is 512334. For the older KK105 I would need to check, if we still have the inner assemblies.
Spare parts are available via Exhibo S.A., Milano.
If you want us to try a repair of the remaining parts, please contact Exhibo as well, for forwarding to us in Berlin.
Best regards, Martin Schneider / Neumann Mic. Development