Welcome to the Forum from South Carolina. Page 41 of Owner's Manual. It would help if we knew what brand slide drive you have.
If Lippert, it may be outside under the floor.
www.youtube.com/watch?v=z64K-p1sfaQMANUAL OVERRIDE
ABOVE FLOOR SLIDEOUT
Manual Override (Single or Double Rams)
Should 12 volt power fail and there is no 120 volt AC power available,
follow the directions listed.
Access to the ram is under the floor of slide, sofa or dinette, and is from
the front. Lippert Component System has a smaller motor, less draw and
requires a 5/8” socket, ratchet and probably an extension shaft.
SCHWINTEC
A. MANUAL OVERRIDE ELECTRIC
1. Locate the circuit board
2. Press the “mode button” 6 times quickly, press a 7th time and hold
for approximately 5 seconds. The red and green LED lights will begin to
flash, confirming the override mode.
3. Release mode button.
4. Back inside coach, use the normal control switch to retract the room.
B. MANULLY PUSH ROOM IN OR OUT
1. Unplug both motors from circuit board. This releases motor brake.
2. Push or pull room in as desired. Larger rooms may require several
persons to move slide. Keep both sides even .
3. When room is fully in, plug motors back in. This is the brake for slide.
4. Room must be travel locked during trave