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1. The latching relay can fail in the on or off position. Sounds like yours failed in the “on” position. With no shore or gen and engine not running, assuming your house batteries are charged, can you still turn on coach DC lights and fans/water pump? If yes then the use/store latch relay is on and apparently is not turning off when you go to store position. You should hear the relay operate and release when use/store is operated.
2. There are parasitic loads in most coaches that draw current from the house batteries all the time and are not necessarily turned off by the use/store latch relay in store position. Like propane and CO detector(s) as an example. Many RVers use manual battery disconnect switches located right on the appropriate battery string terminal(s)......so they are totally isolated when you want them to be.
3. Good question. Depending on the battery charging control system your coach has there is typically an interconnect (or emergency start) relay that can also be operated by the battery control system to connect house and chassis batteries together.....for example when driving the alternator can be used to charge both sets of batteries; or when on shore, the converter can be used to charge both sets of batteries. So unless you also have some parasitic loads on the chassis battery there may be something wrong with your emergency start relay or the battery control system. You definitely want to check this out ASAP.
Last comment, if your battery strings were not fully charged when the shop got your coach they would not last long depending on the loads left on them.....or possible shop workers' using lights etc for their required work.
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