SixStringer

The black square marks the area underneath the two key contact surface.

I removed the rubber domes above the non functional keys and tried in on the other keys and it works. I used the rubber domes aligned above working keys on the faulty ones and it doesn't work. I have ruled out the following (1) Rubber domes (2) Conductive striping under them (3) Any corrosion around the striping that could affect the etched circuit. What I cannot ascertain is if the little black transistors / diodes underneath have conked off. I don't have a multimeter at the moment.

My cat urinated around the keys (5th F#, G) and now after letting it dry for several days I noticed two keys are dead. I opened up the unit, cleaned out the key, rubber contacts and the PCB with alcohol and no luck. The keys to either of their sides work perfectly fine. So I opened up the PCB that lies beneath the rubber contacts and cleaned it as well. I cant seem to find any component burned out or corrosion damage from the cat urine so far. What could be the problem? ... Is there a way to run a diagnostics through the USB port to check if they are working? Unfortunately the ASC in India is quoting and initial estimate of $300 (and that too no guarantees on time or success as they are unsure they will get parts for a 7 year old keyboard) .. I don't want to thrash the unit as it has served me well and I can probably live with it for some more time until I save to buy a new one. But getting it fixed will be awesome. I am hands on opening assemblies so any help is appreciated.