we use pbps_passthru.dll to get the password of the managed account for Application sessions from AutoIT script. Currently this dll call has no logging at all. There should at least be logging for the below items.
Which application was called to establish the application session
Managed account name
Which UVM is being used for the virtual channel call to get the password
A unique identifier in both pbsm.log and the pbpsp_passthru.dll call so that both transactions can be identified and tied together