Lg front loader makes squeaking sound and struggles to spin

The drum is powered by a small motor and pulley, inside the unit and under the drum. A large belt wraps around the drum and pulley, and a spring "thing" provides tension so that the belt won't slip. The squeaking sound indicates that something is slipping, and the sluggish drum says that it's the drive belt. Take off the back, locate the motor/pulley/spring thing, and check the belt tension by observing the belt with unit operating. At that point you should easily locate the noise, at the motor (noisy bearing, lube or replace), belt warn (replace) or possibly the felt pads located at the top of the drum worn (not as likely but they do fail causing the drum to resist being spun by the motor to the point that the belt starts to slip. Hope this helps!