Joining old employer with previously approved 140

[usa.canada.ram]

Hi, I worked for company A 3 years ago and they filed my GC in EB3 and also have an approved 140 from A. Then i moved to company B, where i ported the date from A to B for EB2 filing also have an approved 140 from B. Now recently moved to company C but thinking of going back to A.

1) if i move back to A, do i have to start the process allover again? they still have not revoked my 140

2) B had the date port from cmpny A, and they revoked my 140 bcos i moved to C. What happens to my priority date in this case?

3) If C is willing to do GC, can i port the date from cmpny A? bcos cmpny B already revoked the 140?

thanks in advance

[Belle]

1) If you have the same job, then no, you can use the approved I-140.

2) Nothing happens to your PD.

3) You can still use your PD.