You can download the service manual for your make/model slide mechansm from:
https://support.lci1.com/slide-outs/
You already know the motor and controller is good because you used it to retract the rear of the room.
If the front motor and controller was good and heard running, then the shear pin might be _ er, sheared.
DO NOT replace a shear pin with a hard bolt, you want the cheapest easiest to replace part to fail first, instead of the expensive parts.
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2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA.
"We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln