Roof top ac compressor overheat

My lennox 5ton roof top ac unit stop working. get two Ac mechanics quotes. Both quotes around 2k-3k to fix the issues. The reason for the ac unit stop working is the compressor overheat and shutdown down after running for 10 min. The fan is still running but compressor is shutoff. one company claimed to replaced the capacitor and maybe the compressor may need to replace(extra charge) and the other company claimed that the problem is the txv valve needs to be replaced. i don’t know who to trust and it’s worth it to put 2k-3k to replace this roof top unit.