For a few days there was a grinding sound whenever the door started moving. Now the motor spins freely and the door stays exactly where it is.
Halfway up, the door lurches. Something in the drive skips a beat, the chain jumps, and the door finishes its travel with a jolt.
Someone tightened the belt last month to stop the sag. Now the opener sounds like a chain drive, the motor labours on the way up, and the whole rail vibrates under the ceiling.
Press the button and the motor hums, but the door stays exactly where it is. Under the housing there is a dusting of white plastic shavings, the sign of a stripped drive gear, and this is the second time it has happened.
You press the remote, the door drops a few centimetres, then climbs straight back to the top while the opener light blinks. Nothing is under the door.
Your remote was in the visor when the car was broken into last night. So was the insurance slip with your address on it.
It is February. You come down in the morning and the garage door has stood open all night; the car is frosted inside, the furnace has run without a pause, and the pipe in the shared wall is your first worry.
It is the coldest morning of the year. A week of slush and road salt has crusted over the outside release lock, the key will not seat, and the opener inside is silent after the overnight outage.