Your water heater is maintained by AC Services, with the cost of repairs and replacements paid for out of PMA funds. If you need service please call a trustee before you call AC. Currently AC is installing Rheem 40 gallon Professional Classic gas water heaters, model PROG40S-38N-RH62. Their life expectancy is 10 years and they cost about $1700 to replace.
Here is the spec sheet:
And here is the manual: