As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - FLIGHT CREW NOTICED A LAG IN THE PITCH CONTROL FROM NEUTRAL TO AFT 1-1.5". WORSE AT LOW SPEEDS, WITH FLAPS AND GEAR DOWN ALMOST 3" OF PLAY, PULLS THROUGH NEUTRAL WITH BUMPS AND A LAG. MAINTENANCE REPLACED ALL THREE LEFT ELEVATOR PCU'S AND ADJUSTED THE ELEVATOR POSITION INDICATOR. COMPLIED WITH PCU RIGGING. OPERATIONAL CHECK FLIGHT GOOD. AIRCRAFT RETURNED TO SERVICE, S/N'S OF PCU'S MAL0137, MAL0051, MAL0047.