Including the two things you fixed for nothing — because a favour nobody notices is a favour you paid for.
You cleared the line and re-seated the duct. If the receipt says $189 and nothing else, the customer paid $189 for a capacitor.
Listing a favour at $0 is the only way it registers as a favour. It also makes the charged line look like what it is: fair.
The filter note is not an upsell, it is a fact with a date on it — and it is why they call you rather than searching again.
A number on an invoice, and a customer who has no idea you did anything beyond the thing they can name.
Your first tool is $149 — any tool after that is $49. One $19/mo Tools Care plan covers your full workflow. You own all of it: the tools, the number, every contact in them. Not sure where to start? The $200 audit maps your workflow and credits toward the build.