E500 Noise Issue

Please correct me if my understading is wrong:

  1. Issue reported
    • Noise level is high on channel 2 even when its coverage area is less overlapped with other APs.
    • Based on description, it seems Mesh link is established between two E500 APs.
  2. Technical Information Required
    • By any chance, did customer monitor noise levels on the same channel using third party devices.
    • Is 5GHz allowed at customer site?
  3. Recommendations