UPDATE 3: shared water meter
The plumbing is fixed!
Strata manager issued a 7 day breach notice letting the owner, who claimed to be away, know that a locksmith and plumber would attend the property.
He replied the day before, after not responding to the Strata Manager since December. He said he would give access if they waited until today, so it was an additional week to the first breach notice.
The upshot is that 18 units paid about an extra $1,200 per unit over the last 12 months which equates to 12.4 Olympic sized swimming pools of water gurgling wastefully down the drain.
Waiting to hear back from the Strata division of Legal Aid to see if there is any way for the other owners to recoup any of the costs. I'm not holding my breath though.