Nelson - 18 Months In

Our good friend Nelson, AKA The Xerox Phaser 7760DX, has just turned the ripe old age of 18. . .months. To celebrate we are having a contest. In the past 18 months, Nelson has printed over 160,000 pages, and saved over 45,000 pieces of paper (that's over 90 reams) through duplex printing.

Here's the contest:

The first person to answer this question correctly via blog comment will have their srg.com mailbox increased by 50mb. (Members of the SRG Biz-Ops BPT and their families are excluded as well as people who don't work at SRG)

As previously stated, Nelson has printed over 160,000 pages in the past 18 months. How many service calls that have required an on-site technician has Nelson had in that same period of time?