What was found
INSPECTION TYPE:NA *** AIRTURN BACK *** L MAIN GEAR WOULD NOT COME UP ON DEPARTURE. CHKLT DID NOT GET GEAR UP. RESULTED IN ATB TO KONT NOTE: BOTH PRIMARY AND SECONDARY GEAR INDICATIONS WERE RED (UNSAFE) WITH THE GEAR HANDLE IN THE UP POSITION. BUFFET AND NOISE IN THE AIRCRAFT ALSO CONFIRMED THE L MAIN GEAR WAS STILL DOWN EVEN THRU THE GEAR HANDLE IN DOWN POSITION.JACKED A/C & ACCOMPLISHED MAIN GEAR PER OPERATION TEST IAW AMM 32-31-00. LH MAIN GEAR FAILED TO STOW. NOTICED A MISSING SOUND FROM LH RETRECT ACTIVATOR WHEN HYD PX APPLIED. FURTHER TS REQUIRED 7273207 07/21/23. REMOVED LH GEAR RETRACT ACTUATOR PER AMM 32-33-30 AND INSTALLED L/H GEAR ACTUATOR.