[Netdisco] Aruba Instant AP Serial Number Help

[n b <hao...@ya...>]

I have the same problem and can't get it sorted. Have hundreds of various models of Aruba IAP across campus. When I SNMPwalk them from the cli, serial reports as undef. 
When I try netdisco-do show -d <IP> -e AI-AP-MIB::aiAPSerialNum it too returns undef.
I *believe* I modified the Aruba.pm correctly but have the same results.

Vertiv / Liebert UPS, HP switches and some of my Unifi Nanobeam bridges - Netdisco discovered those with no problem at all. 

I have read the earlier posts about this issue and just not making any headway. Understand I am only days into a Netdisco install so I have much to learn. Was there a resolution and I am overlooking something simple?
Thanks