Hi Rod,
I purchased a refurbished 3880 from Epson about 14 months ago and it started throwing the 150C error code just before Christmas. I tried the "unplug the printer, move the print head, plug it back in, pat your head while rubbing your belly" routine a number of times with limited success. I contacted Epson for the second time a couple of days before the warranty expired and asked for a replacement printer. They sent a replacement overnight and paid for shipping both ways. So far the replacement has worked flawlessly. Based on my limited research I don't believe many 3880 units have the 150C problem and wouldn't hesitate to purchase another referbished unit. I was disappointed with the original problem but would rate Epson's handling of it as A+.
Later,
Johnny