My '09 Magna doesn't that I know of.
Pull the shower valve faceplate off and see if there's a proportioning valve or high temp protection valve that might be clogged.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 Jeep JKU Dragon Edition