AA S410 TDR Power loss... Urgent advise needed.

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After missing a few REALLY easy shots yesterday, I decided to double check my zero. Although still perfectly in line on the Y axis, the group of forty shots were landing a good 5 inches below where they had landed the previous day, plus I can now clearly see the pellet through it's flight. I've noticed a decrease in power over the last few outings and although I don't have a chrono, it's pretty obvious but grouping still remains very tight.

 

Should I send the gun to AA directly to get it serviced and if so how much would I be looking at and on average how long would it take?

 

Does anyone know of any other companies that can offer a similar service quicker?

 

Am only worried about time as harvest has just kicked off and pigeon season is going to go massive in the next two weeks.

 

Any advice greatly appreciated as always!