Translation needed for repair terms

[watch watcher]

I bought a watch a few weeks ago which was DOA. I returned it to them (an eBay vendor / B&M jewelery-type of store) and this is what they said about it:

"The watch has been tested for the power reserve as well. My watchmaker held onto the piece for 2-extra days just to make sure. The watch is still keeping perfect time this morning. My watchmaker shared that the watch was 'out of beat' and the adjustment was made to get the beat back in place and he also tightened the detent screw.


Does this make any sense and what does it mean; would you be confident that it is the cure for a dead watch? Dead meaning it would run for 15 seconds or so and sometimes 15 minutes, but mostly is lasted only seconds. Cal. 3035.