Steve:
IF the circuitry is #12 and has a 19 amp load, eventually (real world) there could be heat damage to the insulation, leading to a L/L, L/N, or L.G short. Understand, 'long term'.
You may want to stress the fail rates of the e-ballasts units ($$$) and the possibility of fines ($$$$) from the local fire officials as a reason to correct the issues. Our Fire Official has a violation book with a lot of $$$$ fines.
Scott35 probably has facts on the heating issues that are more in depth than my 'street' version.
