Glad you traced the fault.
Hopefully Suzuki do a kit. Tohatsu didn't - so I made something up myself with motorbike brushes and springs from Meccanno (120b springs) - fit like a glove! The trim motor itself was mint - so no reason to pay £200 when it can be repaired. I used Mobil ATF220 fluid to top up. Purging the system of air is a pain - and takes time.