And, based on your analog pin assignments;
Code:
ANALOG1 VAR PORTA.0 'ANALOGNI VHOD1
ANALOG2 VAR PORTA.1 'ANALOGNI VHOD2
ANALOG3 VAR PORTA.3 'ANALOGNI VHOD3
If you change ADCON1=%10010111 to ADCON1=%10000100, that would
set RA0, RA1 and RA3 up as analog inputs to match. Assuming analog Vref
is Vdd & Vss.