Thanks to Owner-Manuals.com! This manual was exactly what I needed. As Amana was purchased by Maytag and later by Whirlpool, there was no way to receive it from their websites. I was lucky to find this resource.
A comprehensive Operating and Service Manual. All schematics are complete and easy to read. The PCB drawings and complete parts list are very helpful. I would definitely recommend this manual.
Text excerpt from page 7 (click to view)
CLEANING THE HOSE AND NOZZLE
The vacuum cleaner stops automatically if the nozzle, tube or hose becomes blocked, or the filter and dustbag are blocked. Disconnect from the mains and allow the vacuum cleaner to cool down for approximately 20-30 minutes. Clear whatever is causing the blockage and/or replace dirty filters or the full dustbag. Then restart the vacuum cleaner. Tubes and hose 1 Use a cleaning strip or similiar to clear the tubes and hose. 2 It is sometimes possible to clear the hose by "massaging" it. However, be careful in case the obstruction has been caused by glass or needles caught inside the hose. Note: The warranty does not cover any damage to hoses caused by cleaning them. Cleaning the floor nozzle 3 To avoid reduction in suction power, frequently clean the dual purpose floor nozzle. The easiest way to clean it is by using the hose handle.