Maintenance covers Bug fixes for development done based on specifications on the tasks under project PSUS - Tech Quickstart for which customer is paying ongoing maintenance.
Be careful of scope creep (Anything outside of original spec on PSUS - Tech Quickstart task is scope creep)
If customer not paying maintenance fee in any manner then the Bug is not covered under maintenance and task should be created under PSUS - Technical Support
Pay attention to following:
Include original development task(PSUS - Tech Quickstart) reference in the Maintenance request.
This is same as /help, so include screenshot/video and give use cases on how to reproduce this with test database you/customer tested on. (we can not figure everything from one line explanation or just a screenshot)
Follow-up with the developer who originally developed the task if possible.