[Closed] Rebuilding Shimano SLX older style brake levers?

Mine's leaking 🙁
And very difficult to see exactly where from.

Think it's the M665 model, about three years old.
Nice people at LBS have contacted Madison, but they don't do separate seals or rebound kits.

LBS are great and will probably manage to sort something out with a secondhand lever, but wondering if anyone managed to source some seals for Shimano brakes, just in case this happens again?

And yes, I should have gone for Hopes again, but I prefer the feel and performance of Shimano brakes.

Thanks in advance.