The PL-L1000 or (a)model was not an entry level turntable, was not cheap $$$ on the retail market and not offered for sale in the US. The Phase Linear 8000 (owned by Pioneer) model retailed in the US for $700-$800.
I've owned 2 pl-l1000 tables for many years, my first was purchased from the Navy Exchange circa 1980. That unit has gone through several repairs and spent many years in a box as well but for a different reason than yours. My son managed to find a service manual for the 1000 but is still looking for one for a 1000a. Chances are your 1000a will need more then just a stylus after sitting in a box for several years. If the cartridge you have with broken stylus is the original Pioneer that came with the unit...throw it away and keep the headshell, they make much better units. Audio Technica, Ortofon, Shure and Stanton are just a few manufacturers that make better units and they can be had at places like LPGear, Needle Doctor and many other places. Parts for this unit are not readily available and closer to scarce at best. Several of the IC clips on the 1000 model are proprietary and are no longer available anywhere.
I would be surprised if the rubber suspension cups that cover the top of springs inside the plinth feet weren't rotted and crumbling as well as the tiny drive belt that is part of the tonearm lifting mechanism. These turnables DO NOT transport well and are very susceptible to damage unless you use the carriage tranport bolts and transport blocks that came with the unit. So be aware that this turnable doesn't always fair well after sitting in storage for long periods of time.
There are two AK members here that have an awesome level of knowledge about this table and they would be
@Pio1980 and
@markthefixer. Both gave my son a great deal of assistance when he was repairing my 1st PL-L1000 which was plagued with speed/quartz lock issues most it's life. It has been playing perfectly for over 2 years thanks to all 3 of them. If you are able to just replace the cartridge (recommend) you will need the stylus overhang gauge, that came with table, to properly align the cartridge.
All that being said; I love my (2) PL-L1000 tables, wouldn't trade them for anything under 4 grand and have to say you have one lucky daughter. All my best to you in getting your 1000 back into service.