Okay Mary, now I'm with you.
Without looking up the diagnostic procedure on those codes, a tune up doesn't make sense, but again I haven't looked them up. I would suspect that "They also repaired the harness connectors, cleaned and tightened terminals in connectors C-123 and C-124; cleaned grounds #G103, G104 and G105" was the Check engine Light issue.
The person you spoke to that quoted the may have worded it to sound like you needed the tune up also, or was mis-communicated to by the technician and believed the tune up was the source. Our industry suffers from lack of quality communication as well as a customer's blockage of communication. I don't know that this is the case or not, but that's my take at this point. You very well may have needed the tune up regardless so don't feel jaded about the tune up.
As far as the timing belt, the link I placed above gives the timing belt intervals. This is the particular one for your truck:
The asterisk that is placed after the DOHC means you have an interference engine. Go to the link to see the details for that. Bottom line is that is it breaks, it may trash the engine. You most likely will not get any warning signs. What you first need to do, is determine if you have California (CA) or Federal emissions. As you can see in the image, there are 2 different timing belt intervals. It may show you on a white sticker under the hood. If not call the dealer with your vin number and ask them.
If you have federal emissions, it should have been done at 60,000 miles. Now here is the gamble. Did the previous owner replace it, meaning you have until 120,000 miles, or did they not do it meaning you have a time bomb?
Thursday, August 23rd, 2007 AT 4:44 AM