*1. Sears Parts Direct*
- Visit the Sears Parts Direct website.
- In the search bar, enter the model number of your garage door opener, 139.53910D.
- Click on the "Search" button.
- Select the "Garage Door Openers" category from the search results.
- Find your garage door opener model and click on it.
- On the product page, scroll down to the "Documents" section.
- Click on the "Owner's Manual" link to download the manual in PDF format.
*2. ManualsLib*
- Visit the ManualsLib website.
- In the search bar, enter the model number of your garage door opener, 139.53910D.
- Click on the "Search" button.
- Select the "Garage Door Openers" category from the search results.
- Find your garage door opener model and click on it.
- On the product page, click on the "Manuals" tab.
- Select the "Owner's Manual" option and click on the "Download" button to download the manual in PDF format.
*3. Craftsman Manuals*
- Visit the Craftsman Manuals website.
- In the search bar, enter the model number of your garage door opener, 139.53910D.
- Click on the "Search" button.
- Select the "Garage Door Openers" category from the search results.
- Find your garage door opener model and click on it.
- On the product page, click on the "Manuals" tab.
- Select the "Owner's Manual" option and click on the "Download" button to download the manual in PDF format.
