Noisy/squeaky outside basement air conditioner noise

We have a 2001 Itasca with basement a/c. The basement a/c is working fine, cooling, all seems well inside. But outside the unit is sorta noisier than in the past, and somewhat squeaky. I'm only assuming this is from the outside blower because inside all is normal. I read somewhere that you need to lubricate the outside blower bearing area with some oil annually. I've never done this, and I don't know how. Do you have to remove the basement a/c from the motorhome bin to access the unit from the top to perform this annual 'lubrication'?