Refrigerator song

Yes, yes, I know, it's the bearings, but...

So, I bought this refrigerator new in 1999. Thus it is ten years old.

I've had a varied refrigerator history.
- My first one was a trade for a drawing of a horse, and I swear I don't remember the details of that, except that it was from a friend's boyfriend, Bruce - but it lasted for the year it needed to.
- A rental place refrigerator, no problem.
- A new one my husband and I bought at Sears eventually went into bearing song, alas, but it was within appropriate years. That is how I recognize the noise.
- In our gallery, we bought a St. Francis de Paul refrigerator (swirling brown robes) to keep the lunch stuff, and it lasted about six years.

So, when I moved into this house in Albuquerque and got the fridge out of storage (money flowing), it was fine for, say, a month, then it started tweeting.
Roger visited and said, you know, this can be a matter of balance, and so I moved the refrigerator a bit, and it shut up. I tried with the wheelie things and couldn't move them at all, no matter what the level above said, I can't ratchet them. I have been moving the refrigerator since then. Let's say that was in 2007.
Every two or three months, the tweets started and I moved the thing and it shut up.

Balance, I get that, and I have a good long level, 48". I already know it is off level, as the door tends to close on its own. I have a good pry bar. I know there are little wheelies to level the fridge at the bottom, but I can't move them, nor work the pry bar.

So, my question is - is this worth hiring someone to come balance the refrigerator? To reiterate, it doesn't sing all the time, but does a bit, at the least, every day now. What are the chances that if I get it balanced, it'll last a while longer? It's a Sears Amana, not low end, but, 1999.

Given the price of a new refrigerator and the price of hiring someone, what would you do, if money were spare.