What was found
DURING TAXI OUT, LEFT ELEVATOR INDICATION DOES NOT FOLLOW FLIGHT CONTROL INPUTS. AIRCRAFT RETURNED TO BLOCKS (BTB). DEFERRED IAW MEL 27-08-1. MTX PROCEDURES C/W. PLACARD INSTALLED. MAINTENANCE GAINED ACCESS TO LT ELEVATOR TRANSMITTER, FOUND BIRD NEST. CLEANED AND REMOVED AS NEEDED. CLEANED CANNON PLUG D1858 ON TRANSMITTER IAW SWPM 20-60-01. INDICATION OPS CHECK GOOD AT THIS TIME. DI CLEARED. PLACARD REMOVED. AIRCRAFT RETURNED TO SERVICE.