150 Four Stroke MAP sensor

Hi folks, I have a 2022 Mercury 150 four stroke outboard with just over 400 hours on it. Immediately upon our first launch this year, it began idling rough and then commenced with the six beep alarm. We returned it to the service department that commissioned it and changed the fluids, etc.
They tell me the map sensor is bad and needs replacing. Fine, I’ve seen threads that seem to support that, assuming they are reading the codes properly. The boat is in dry stack off the trailer, and I can’t easily get to it to go over it myself. So the question is this:
They have quoted something like $150 for the sensor and $600 for labor to replace it. I can’t find a service manual or video of this procedure. Are there really multiple hours of labor involved in replacing this sensor? I would think it to be a simpler task than that, unless it’s buried under something. Any thoughts on the level of effort for this job?
Thank you.

Welcome
If you can provide the motor serial number we can look up which manual is needed

Thank you!
3B110878

The serial number comes up as a seapro model and standard model
Your parts are HERE

The service manual for all models is 8M0168224
Parts and other manuals are HERE

The MAP sensor is item 14 and requires removing 1 screw (item 12) and would take all of 5 minutes. Most of the time would be removing and replacing the cowling

What codes were found

This being a Verado/Seapro do you have a AGM battery for starting?

Thank very much. That’s what I suspected. And yes, I have a good AGM battery, which I installed when we bought the boat and it was not equipped with one then, and I saw that it was supposed to be. I appreciate the assistance.