I can't remember if they use MCSO or Mesa 10 codes but MCSO codes are posted
Phoenix East Valley Law Enforcement Live Scanner Audio Feed there.
Mesa 10 codes:
10-1 Receiving poorly
10-2 Receiving well
10-3 Emergency traffic
10-4 Acknowledged
10-5 Stakeout
10-6 Busy
10-7 Out of service
10-8 In service
10-9 Repeat
10-10 Out of service
10-11 Out for restroom
10-14 Transporting subject
10-15 Prisoner in custody
10-19 Return to station
10-20 Location?
10-21 Telephone
10-22 Cancel, Disregard
10-23 Stand by
10-25 Bar check
10-27 License check
10-28 Registration check
10-29 Wants/Warrants check
10-33 Emergency traffic
10-35 Confidential info
10-36 Time check
10-37 Prepare to copy
10-38 Warrant confirmed
10-40 Stolen vehicle
10-42 Officer at home
10-45 Meet at
10-52 Change channel to
10-53 Attempt to locate
10-71 At range
10-78 Detention facility
10-79 Death message
10-90 Traffic signal out
10-91 Motorist in trouble
10-97 Arrived at scene
10-98 Finished assignment
All from Southwest frequency directory, I'd suggest purchasing the book it has a lot of good info in it not found here on RR.