As your sounder is working and your sensors are OK ie live - i would look at the connector block between the parking ECU and the sensor loom - the 4 sensors lead into the connector then out ot your parking ECU . I had similar issues 2 years ago - the long tone as well as silence - there was corrosion on the wires and terminals in the connecting plug.
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She came off the Longbridge Line on 20-05-2003
The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.
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