Note that all numbers repair/damage-wise here add up. I assume it is simply looking at the final AGs after the week.
Vanilla T1 Day 1
Performing the T1 ADs we get 80 planes damaged (likely 90%+ of this by OPS).
We start out the week with 830 damaged planes (someone must have set this up - I know there are rather exact figures to be found about how many Aircraft in the Luftwaffe were operational). Mind that this is after weeks/months of preparations pretty much without combat operations (except recon flights)!
After one day of operations containing ~3500 sorties we end the day already with less damaged than before (+80DAM -129REPaired). Not to mention the result for the whole week.
Is that not a little weird? Anyone?

- Damage and repair rates_vanilla.jpg (129.95 KiB) Viewed 73 times
Vanilla T1 Day 1-7 for GA ADs
For the sake of argument we could assume that the other 6 days without combat operations just made it to be like this.
So now let's fly the GA ADs for all 7 days of the week.
We somehow see that it doesn't really matter. We added 394 damaged planes (again I assume 90%+ by OPS) but ended the week with only 43 more damaged planes as in the 'regular one day T1'.
The total Damaged planes therefore still decreasd by 830-573=257.

- Damage and repair rates_7days.jpg (142.57 KiB) Viewed 73 times
Even if we'd assume some DEStroyed planes due to OPS being damaged and "written offs" (Let's say 50%) it would not look all that much better.
Coclusion:
So what remains is that weeks/months of preparations without combat left the Luftwaffe maintenance wise in a worse state than after a week of combat operations.
...for the sake...Vanilla T1 Day 1 - Air-Leader Ratings all 1
Maybe here we see Air Leader Rolls at play....let's look at this...
...nope, ...
Leader impact has not been found.

- Damage and repair rates_vanilla-Leaders 1.jpg (163.95 KiB) Viewed 73 times
I'll attach another Air-Leader Rating 1 Losses chart, ...before someone looks at the above results and argues he'd "
see that Air Leaders would play a role in Air combat".

- another Leader 1 T1.jpg (23.68 KiB) Viewed 73 times