We winterized our boat this year (although it is usually not necessary in our climate) ....because we had very little experience in doing so, we had a professional do it. But, when he came to de-winterize our boat and do spring maintenance, he turned on the water pump only to find water coming out of the Fontana faucet in the full head shower. This is a new boat and we have never used the shower ever. We took off mounting plate on faucet and it looks as if the 0 rings might need changing out. Any information on how to remove the insides without tearing it all apart or should we simply order another Fontanta faucet. Also, is the access in the cavity available like the R-29 (at the foot of the 2nd berth where ac return is located)? Thanks.