Another Disco 4 Torque Converter Shudder

We bought the car with 160k about 3 years ago,
The previous owner may have had TC Shudder, put in Shudder fix and sold the car.
Now with 208k I had the transmission serviced, the shudder fix drained out and the problem is back.

Left Sydney on our way south driving in command shift, about 20mins out the red light came on Restricted Performance, pulled into a side street, checked with the tool. Turbo problem.
Cleared the fault.
Put the van in storage and drove back to the Gold Coast, no shudder or fault lights.
Will put in some shudder fix and then onto the turbo issue.

Quote:

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Originally Posted by Woz

We bought the car with 160k about 3 years ago,
The previous owner may have had TC Shudder, put in Shudder fix and sold the car.
Now with 208k I had the transmission serviced, the shudder fix drained out and the problem is back.

Left Sydney on our way south driving in command shift, about 20mins out the red light came on Restricted Performance, pulled into a side street, checked with the tool. Turbo problem.
Cleared the fault.
Put the van in storage and drove back to the Gold Coast, no shudder or fault lights.
Will put in some shudder fix and then onto the turbo issue.

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I thought shudderfix was used to remove glazing from the TC plates. Once that is done, it serves no further purpose, so draining/replacing fluid should not make a difference?