I have 2004 Cardale Thermaglide electric roller garage door, never had a problem until now. Tonight it wouldn't raise past maybe 4 inches and the motor makes a buzzing sound. If I give it a helping hand it moves a few more inches then stops again, once over halfway up it goes itself then, coming down is no problem I'm guessing the motor has gone, It's a tubular motor. Has anyone had the same problem ? Is it a DIY fix/replacement ? I'm guessing the shutter would have to come off. What would one cost to have it all fitted by someone/a company ? Are some motors better than others ? Thanks for any advice !