They are waiting for one pilot to go on unpaid leave, so they can afford to overhaul the broken engine.
Cheapskates. At my airline you could probably buy a new engine on a pilot's pay per month .......
that can't even do a simple COPCO start with first having to look at his procedure manual.
That's just to give the engineer some time to figure out what the cockpit hand signals meant. It is rude to look impatient when they are trying their best.