Question on P0456 small evap leak code

[mm5300]

I have a B8.5 S4 that I purchased recently, but is unfortunately not still under warranty due to the mileage. The car recently had the check engine light go on and I have the Carista dongle, so I used it and came up with the code P0456 very small evap leak. In an attempt to find the issue myself, I replaced the charcoal canister, and the purge value (8K0 906 253L) that I got from ECS Tuning. The vent tube that goes across the top of the canister (8K0 201 997AK) seems to be ok, but I still have the code. Based on another post I saw from jl87, it looks like there's a TSB 2035073 that might possibly be the issue. From what I can tell from the wording on the service order, they open the purge value and replace G400 inside it. Does this sound right? Seems like they would just have a new purge valve to install. I guess my 3 questions are:

1. Since it looks like the TSB came out Dec 2014, does a brand new purge value get me the correct G400, or whatever it is?
2. If I still need this G400 where would I find the correct one since the service order just says replace on G400 or another?
3. If this doesn't end up being the issue, where else would someone start? I know people have mentioned the gas cap, but looking around, that would show as a major evap leak.

Thanks and any help would be appreciated. Here's the service order and credit goes to jl87.

[Adrenalin Junki]

Did you replace the gas cap? That's a common problem as well.

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[mm5300]

No, I haven't, they seemed to mention that the gas cap would show as a major evap leak, but I can certainly give it a try. Thanks.

[Adrenalin Junki]

After you change out the gas cap, make sure that the code is cleared. It won't go away without clearing.

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[edleeid]

No, I haven't, they seemed to mention that the gas cap would show as a major evap leak, but I can certainly give it a try. Thanks.

Hi, mm5300, were you able to fix the issue? I'm getting a same code once in awhile, and trying to figure out where to start from.