While you wait for answers, we may have found some information which could help you.
Click here for Leaking Bottom FrontGainsborough 8.5e ?
How do I remove the hose from my Gainsborough Energy 2000 shower?
Gainsborough 2000x leaking from bottom of copper cylinder ?
Gainsborough 8.5 se hot/ cold water problems ?
Gainsborough 9.5 on/off switch repair?
Clean shower head?