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I think that in both your case and the case of the person who started this thread, the first step would be to retrieve the error codes stored in the "On Board Diagnostic" units (OBD). This procedure is outlined in the FAQ and doesn't require ANY tools at all other than a pen or pencil to write with. For the transmission on the 960's, I think the relevant codes should be at position A-1. The ODB will distinguish between faults in the PNP switch & the transmission rpm sensor. Both of these can or do cause the flashing lights.
A very knowledgable dealer mechanic told me that if you're driving the car with the transmission mode lights flashing, you're damaging the transmission. My experience has been that the the OBD codes have clearly and correctly identified the faults in both of the aforementioned cases.
You retrieve all the codes & write them down, then clear the codes and retrieve them again when the lights start flashing again. You will have to drive the car, and it will have to warm up. By doing this checking and checking again, you make sure you're not fixing an old problem for which the fault code was never cleared. In the case of the PNP switch, it's not all that uncommon for people to always assume that it's the culprit for the flashing mode lights. If they see an error code which ID's the PNP switch, they're inclined to just replace it only to find out afterwards that the rpm sensor is bad and the PNP code dates back a couple of years but was not cleared when the PNP switch was fixed.
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