Partial Collection Failure - on 3750 Switch stack

Help discovering two switch stacks, Have discovered network with problems including other 3750 Stacks.  But have two stacks that don't seem to want to get entered into APIC-EM and show partial collection.  Have done the usual troubleshooting like, deleting and re-adding, trying no profile discoveries, CDP discover, single port range discovers and still nothing.  The discoveries show as successful but the topology maps are showing the access switches all over the map not connected the the collapsed core stack. 

 Here it the error message the pops up next to the status of partial collection:

 All information from the device could not be collected successfully. It may be a temporary reachability problem or credentials are not correct. Please re-run the discovery for the device and if that does not resolve the problem, please get in touch with Cisco TAC to resolve your problem    

using SSH V2 for discovery method of connecting, it has worked on the majority of  install base just two switches are being problematic. 

Verify that the devices are working with sshv2

 $ ssh -2 <your device>

 Discovery only works with ssh v2.  The error message is not being displayed at present if this is the problem.  

 Based on the case log, saw that this is a 3750G stack switch.  Failing here in collecting host inventory. No support for 3750G on APIC-EM.  This is a EOL product.

 End-of-Sale and End-of-Life Announcement for the Cisco Catalyst 3750G, 3560G, 3750-E, and 3560-E Series Switches - Cisco

 Even if any  3750G switch goes into "managed" state, you would run into issues with applications EasyQOS, Path Trace. You had also mentioned that you were running into ISR issue. is that still the case.FYI, Below is the complete list of hardware models supported with  APIC-EM 1.2.1 release.

 Supported Platforms for the Cisco Application Policy Infrastructure Controller Enterprise Module, Release 1.2.0.x - Cis…