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On my 1978 FT337GP, a couple of years ago we diagnosed a slight leak from around one solenoid and slow action. It was a pretty straightforward job to remove the whole unit, clean, replace the o-rings and the motor brushes as I recall. Lots of fiddly bits.
Mind you I didn't actually do it myself so it was really easy.
The reality is that it didn't make that much difference as everything was and continues to work ok.
We have had a few micro-switches replaced and/or require slight adjustment, but generally everything works well.
As I have mentioned before when you replace hoses, make sure the down locks stay out of the way until the gear leg moves them and they then pressurise. The hoses can force them out of position in which case they can pressurise and the gear leg may not be able to move them out of the way.
Regards - Dave
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