Hi Ho RonK: What you're experiencing is common to almost every coach with this blower. I did exactly what you have done with exactly the same results. When the weather is better (or when we are in Arizona) I will take off the water heater and try to get to both bearings. I like the idea of puting a tube that allows oil access from above. I believe a new blower costs about $60 or so, so they aren't all that expensive, just hard to get to.
My wife would call me cynical, but I can just hear the engineering review on that blower. "Well WI will only pay $23, but we have designed them to fail in about 3 to 4 years, so we should average another $50 in replacment costs, so it should work out ok..."
I am currently fixing a water softener here at home made by GE. Internet forums have exactly the same comment. Designed obsolescence--about 2 to 3 years. Here they provide a repair kit which probably costs them about $1 to $2 for about $70, so have good thoughts about the blower motor. Anyway, it gives us something to do...positive thoughts.
Dirk