Sealed for life gearboxes. Hmmmm. Change oil regularly was the answer one source gave me after my 3rd gearbox.
certainly on the P38, the ZF4HP22/24 boxes were claimed to be sealed for life. That was amended to change at I think 25K miles. I do mine usually at every third service.
 
Try a mega-flush, you might be lucky. On mine it went at about that mileage and the rebuild went at about 140,000 in Belgium, in the middle of winter! The torque converter burnt itself out.
 
Try a mega-flush, you might be lucky. On mine it went at about that mileage and the rebuild went at about 140,000 in Belgium, in the middle of winter! The torque converter burnt itself out.
It's really odd symptoms so i don't know if it's just dirty oil, or valves/solenoids that are with
 

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