Just a minor nitpick point of style ..
(a) MMEL is generic and produced by the OEM/Regulator. As such it is available to all and sundry.
(b) MEL is an operator-specific tailoring of the MMEL and, as such, is not generally available .. and may well vary from operator to operator.
Note that some Regulators are now running with the MEL side of things, eg, CASA in Australia now produces a GMEL which is a generic tailored MMEL to suit Australian requirements. It is much cheaper for the operator to buy use of the GMEL rather than doing the whole bit themselves.