Graham, looks like Clarke and Tom have covered most of your questions. I will address a few of them however.
Coach Number: The VIN number contained the 'coach number' beginning with the 2000 series. Prior to that, it would be difficult to determine the coach number unless you have some documentation that came with the coach from Newell. 1983 is when the 'new' internal coach numbering system began. That system started with 001 and in essence skipped the first 384 Newells. To correct the numbers, Newell skipped from coach 816 directly to 1200 in the 2007 model year. If your coach had any old documentation from Newell, it is possible that you might find the number, 001 in 1983 through 214 starting with the Series 2000 in 1990, when they began making the coach number the last three digits of the VIN.
Headlights: A great deal of improvement can be made to the existing headlights by installing relays near the front fuse panel for the lights and running 10-12 gauge wire from the power to the relays and from the relays to the headlights. Newell ran the power through the headlight switch, then through the dimmer switch then to the headlights (after going through circuit breakers, at least on the 1990+ models). Using the wiring through the switch and dimmer as a trigger for the relays and installing larger gauge wiring to the headlights will make a VERY noticeably difference in your night time driving experience. Obviously further improvement can be made but the most bang for the buck comes from the rewiring and the relays.
Low Air Buzzer: Are you certain it is low air? The Newells I have seen had a Low Air Warning Light on the dash but no buzzer. There is a buzzer attached to the tag axle dump (where appropriate) and on the air leveling system to warn if you are not in travel mode. If the Low Air light is going out and the supply air and twin brake air gauges are staying above 100 or so while you are driving, it doesn't sound like an air problem unless the air leveling (if applicable) thinks the suspension is not in travel mode.
Let us know if we have confused you.
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