The final episode of "MASH" aired on this date in 1983. After 255 shows, spanning 11 years, Hawkeye, Radar, Hotlips and the gang called it quits with three-quaters of America's viewing public tuned in. If your garage door has done more lift-offs and landings than a chopper in the 4077th, and sounds like it's also getting ready to retire, you can probably extend its service with a little maintenance and TLC. First, lube the drive and all moving parts. There are many lubricants on the market, but white lithium grease still works best. Oil the long tension springs, too, to prevent rust. If it doesn't open all the way or close tightly, there's a nut on the long screw drive or stops on the chain drive you can adjust until it takes off and lands smoothly. With a little lubrication and a few minor adjustments, you shouldn't have grinding, chatters, hang-ups or MASHed toes any more. And that's the On The House tip for today.