Tire pressure light remaining on

Does this sound like an electrical shortage and would it be covered under warranty and if not, about how much are we looking at for repair?

I recently started having issues with my 2007 GS 350, started with tire pressure light remaining on - service indicated nothing was wrong with tire pressure [could pay to repair but were told could just ignore as long as maintained/checked manually], water pump went [but that appeared to be in line with normal maintenance timeline for what one would expect],

Next left head light went out [condensation had formed in the light well] - service looked at fuse/battery and indicated that there did not appear to be an issue, likely just needed to change bulb, when light bulb was changed, the new lamp blew, and subsequently the driver side power panel stopped working [in addition the radio/CD player started acting strange [automatically eject CD, shut off, volume would continue to increase and could not turn off