bex bissel proheat 11. red?

my bex bissel proheat, 11, red, carpet cleaner is not working correctly, [1] there is no spray at all from the upright cleaner, the brushes work fine wizz round but no spray, also no spinning from the flow indicator.
[2] the spray from the hand held works spasmodically, i think ive fixed it one minute, it comes out with a flow, taking the access belt cover of i notice bubbles coming from the pump, these bubbles seem to be preventing the flow, how can i fix it? how can i get at it to fix it? all help greatfully recieved.