Corpus Funds and Maintenance Payment

I am residing in an apartment and the apartment has a association to take control of the day to day activities. As a maintenance cost they have fixed a cost of Rs 1950 per month. The break-up of fixed cost is as below; Payment to Security & maid Common Electricity Garbage Collection Deisel for Generator Cleaning materials Drinking water for guards & maid Buffer money for unforseen expenses Fresh water Tanks Cleaning Garden Maintenance Motor(s) repairs/Electrical Works Main Gates Repairs Bulbs Lift Annual Maintenance Contract Common Plumbing Issues - Drain Pipes Sewage & Septic tanks Cleaning Apartment Adda Subscription Generator Annual Maintenance Transformer Annual Maintenance Borewell repair/Maintenance Minor civil works/Paintings Some tenants feels like the components added in the fixed cost must be borne by the owners and as tenants they are not liable to pay them. These include the below things Lift Annual Maintenance Contract Common Plumbing Issues - Drain Pipes Sewage & Septic tanks Cleaning Apartment Adda Subscription Generator Annual Maintenance Transformer Annual Maintenance Borewell repair/Maintenance Minor civil works/Paintings Hence want to know what are the costs that will be covered by the tenants in the above list and what are the things to be billed from the Owners. The association is not a registered association. Also can the tenants ask for the expense bills for the expenses made by the association? Also what items will be covered in the corpus and sinking funds?