Make a decision
Blower cleaning versus blower replacement
One scope
Cleaning addresses removable deposits on wheel and housing after inspection.
The other scope
Replacement addresses a failed or unserviceable motor, wheel or assembly after diagnosis.
A concrete example
If a wheel is visibly loaded but the motor starts and runs, a cleaning and operation check may be a reasonable proposal. If the motor will not start, request electrical test findings before approving a replacement.
Which question settles it?
Ask for the failure evidence and post-work operating test before authorizing a new assembly.