Identify old and recent components
Mention replaced springs, an added operator or new sections, and bring prior invoices if available. A mixed-age assembly deserves an assessment of its current condition rather than a single age estimate. Explain any change in movement before the routine care work begins.
Keep findings useful for the next decision
Ask what was serviced, what needs monitoring and what requires a separate repair. Record the installed model information with that report. If replacement later becomes appropriate, the service record and Greenacres project documents can help keep the selected scope clear.
Your questions
Can an invoice prove that every component was replaced?
Only if it says so. Review the actual listed parts rather than interpreting a broad tune-up description as a complete renewal.
Is a maintenance appointment enough for a visibly broken spring?
A broken counterbalance needs a repair assessment. Keep the affected door unused and describe the failure when requesting service.
