UPDATE 2-Court lifts Brazil ban on Transocean, Chevron ban eased

* Judge said losses to public outweigh merits of injunction * Ban was part of suit seeking about $20 bln for oil spill * Chevron ban upheld except for spill mitigation, monitoring * Transocean ban still applies to Frade field RIO DE JANEIRO, Oct 1 (Reuters) - A Brazilian court overturned a ban on operations by offshore drilling contractor Transocean Ltd, accepting government arguments that the ban could cause billions of dollars in lost taxes for the government and output for t