Maybe the medicals at discharge were done by Netley doctors?
Someone had posted this (different board):
Times Wed 17 Jan 1876
The Jumna Indian Troopship ….arrived Portsmouth harbour yesterday morning ….from Bombay. The Jumna brought ….. (list of regiments) … 444 time-expired men and invalids, 53 women and 132 children, for conveyance to Netley.
(Naval and Military Intelligence)
I've got to see how I can get access to the Times archives online. Might have to wait until my next visit to England.