OP's letter will get about a 20-second read and will get some garbled response (as it deserves).

If OP can find a carrier with 24/7 mechanics on-duty at small outstations such as his, he should jump ship.

Would love to know what makes OP think that DL overlooks mx issues which require attention. Not my experience, but perhaps he's got some factual basis to share.

A customer DL (and any carrier) can well afford to lose.